Endgame Progression: From First Chart to the Maelstrom

Document type: Design — Endgame Systems
Status: First Draft
Last updated: 2026-04
See also: Nautical Chart | Voyage System | Expansion Model | GURPS Framework | Monsters & Encounters

Overview

Endgame progression in Salt & Steel is the sustained experience that begins when the campaign ends and continues — theoretically — forever. It is the answer to the question every ARPG must answer: after the story, what then?

The answer in Salt & Steel is: the Chart. The sea. The hunt for the next tier, the next boss, the next configuration of modifiers that pushes the captain's build to its limit. For some players, the endgame is an economic game — farming efficiently, optimizing trade, building toward a crafted item that represents weeks of investment. For others, it is a combat mastery challenge — learning boss patterns until they can be defeated under maximum difficulty constraints. For others still, it is exploration — charting every node, discovering every hidden zone, completing the Cartographer's Atlas.

All of these are valid endgame experiences. The progression structure is designed to accommodate all of them without requiring any player to engage with a play style they find unrewarding.

The Post-Campaign Transition

Unlocking the Nautical Chart

The campaign concludes at the defeat of the campaign's final boss — the Tempest Regent, the Ashen Covenant's highest priest who has been conducting a ritual that would have permanently altered the Ember Seas' geology. Defeating the Tempest Regent triggers:

The Chart Unveiling scene: The captain returns to their ship. Mira Cass — the navigator NPC who accompanies the player through the campaign — spreads a new chart on the navigation desk. It is marked with a single note in her hand: "The Home Waters. Where we begin. The rest is out there." The Nautical Chart is now accessible.

First chart node: The chart shows a T1 node adjacent to the campaign's final location — the nearest charted sea zone, close to safe waters, marked as "clear and accessible." This is the tutorial endgame node — specifically designed to introduce chart mechanics in a low-risk environment.

The Cartographer's Introduction: Mira Cass delivers a brief introduction to the Nautical Chart system — approximately five minutes of dialogue and guided interaction. She explains chart nodes, modifiers, and the basics of charting. This tutorial is skipable for veteran players (Voyage 2+ characters) but remains available at the navigation desk if the player wants to review it.

Starting Resources

At campaign completion, the player has:

The Nautical Chart (T1-T5 nodes visible and accessible)
A basic set of ship upgrades (sufficient for T1-T5 content)
3 Common Sailing Warrants (basic chart modifiers, found during the campaign)
Campaign-appropriate gear (functional for the early endgame)
A crew assembled over the course of the campaign (3-5 members, each with campaign-derived histories)

The intent is that the transition from campaign to endgame is seamless — the player has everything they need to begin charting immediately without needing to acquire resources from the player economy first.

Tier Progression: The Path Through the Chart

Early Chart: Tiers 1-5 (Coastal Waters)

Design intent: Orientation. The early chart teaches the systems in a context where failure is recoverable. Enemies hit hard enough to be interesting; they don't hit hard enough to instantly punish undersupplied characters. The early chart is the proving ground where the player learns the endgame's language.

Content experience:

Nodes are small-to-medium zones with 15-25 minutes of content each
Boss encounters are mechanical introductions — each boss uses 2-3 mechanics the player must learn, not the complex multi-phase encounters of higher tiers
Sea lane encounters during transit are minor events (small NPC ships, low-level creatures)
Modifier warrants are Common tier — the effects are simple and instructional

Progression gates:

T3 requires charting 5 T1-T2 nodes (not a hard gate — simply requires engagement with lower tiers before advancing)
T5 requires defeating the T3 boss (the zone boss, not a pinnacle encounter) on at least two separate T3 nodes

Economy integration:

Items found in T1-T5 nodes fund the first meaningful crafting projects
The first Sailing Warrant crafting (combining two Common Warrants into an Uncommon Warrant via the Cartographer's Table) becomes available at T3

First major milestone: Charting 10 T1-T5 nodes. This unlocks:

The T6-T10 tier range on the chart (previously shown as "unmapped waters — beyond current safe sailing")
The Harbormaster NPC in the nearest major port city (introduces the Invitation system)
Challenge unlock: "Cartographer's Apprentice" — the first challenge tier becomes fully achievable

Mid Chart: Tiers 6-10 (Open Sea)

Design intent: Commitment. The open sea is where the captain moves from safe waters into genuine risk. Mistakes have consequences. Enemy power is real. The modifier system starts to matter. Players in T6-T10 are discovering their builds' actual capabilities.

Content experience:

Nodes are larger zones with 20-35 minutes of content
Boss encounters use 4-5 mechanics including environmental hazards (storm elements, flooding sections, elevation changes)
Sea lane encounters feature faction patrols and occasional rival captain encounters
Modifier warrants are Common to Uncommon — real effects that require preparation

Tier 8: First Pinnacle Zone Access At T8 completion of 5 nodes, the Chart reveals the first Pinnacle Zone — the Admiral's Graveyard (the Drowned Admiral's access zone). This is not a surprise; the Harbormaster NPC has been building toward this reveal since the player met them. The Harbormaster's Invitation quest (requiring 15 T6-T10 node completions) culminates in the Drowned Admiral's access.

Progression gates:

T8 requires 10 T6-T7 completions
T10 requires defeating T8 zone bosses on 3 separate nodes

Economy integration:

T6-T10 nodes produce the primary mid-tier crafting materials
The player economy around mid-tier content is the most accessible trade range — prices are set by the majority of the player population who are in this tier

Second major milestone: First Pinnacle Boss Defeated. This unlocks:

The compass fragment toward Tier 2 pinnacle access
The T11-T14 tier range
Challenge threshold: many T1-tier challenges (1-12) complete around this milestone
A Voyage challenge entry: "The Admiral Falls" (specific challenge for first pinnacle kill)

High Chart: Tiers 11-14 (Dangerous Waters)

Design intent: Mastery. Players in T11-T14 have built their characters seriously. They understand their mechanics, they know how to apply chart modifiers, and they are engaging with the full endgame system. The Dangerous Waters are not casual content — but they are accessible to any player who has engaged earnestly with the systems up to this point.

Content experience:

Zones are large with 30-45 minutes of content, including multi-stage encounters within a single node
Boss encounters use 5-6 mechanics including phase transitions and environmental adaptation requirements
Supernatural events are frequent (Ghost Tide appears naturally in many T12+ zones without modifier application)
Uncommon to Rare Warrants are standard — bare-node running is possible but inefficient

Tier 11: Supernatural Storms The T11 tier introduces a new ambient encounter: Supernatural Storms. These are weather events that do not appear in lower tiers — storms that carry spectral energy, that spawn creatures mid-transit, that reduce visibility to near-zero. The captain's weather-management systems (ship upgrades, crew storm abilities, Navigation skill) are now actively necessary rather than situational.

Tier 12: The Second and Third Pinnacle Zones The Leviathan's Furrow and the Last Flagship access zones unlock at T12. The Harbormaster's second Invitation tier requires 20 T11-T14 completions to access the Leviathan and the First Captain.

Progression gates:

T12 requires defeating any T11 boss with a modifier active
T14 requires charting 15 T11-T13 nodes

Economy integration:

T11-T14 drops are the primary source of high-tier crafting materials
Sailing Warrants at Rare tier are primarily found here — creating supply for the modifier economy
Boss-specific drops from T12-T14 bosses are the most traded high-value items in the mid-to-late Voyage

Third major milestone: Three Pinnacle Bosses Defeated. This unlocks:

The T15-T17 tier range
Access to the Harbormaster's final Invitation tier
Challenge threshold: many T2-tier challenges (13-24) complete around this milestone
Legendary Warrant crafting unlocks (combining multiple Rare Warrants into a Legendary configuration)

The Outer Reaches: Tiers 15-16

Design intent: The edge of standard endgame. T15-T16 content is genuinely hard — not artificially inflated, but demanding enough that build choices have direct consequence on survivability. Players who reach T15 have invested significantly in their characters. The Outer Reaches reward that investment while continuing to demand respect.

Content experience:

Zones are the largest in standard content — 40-60 minutes with multiple sub-areas
Boss encounters routinely use 7-8 mechanics across 3+ phases
The full modifier system is engaged — bare-node T15-16 is possible but the reward gap between bare and modified nodes is maximum here
Legendary Warrants are the primary efficiency-maximizing tool at this tier

Tier 15: The Grandmaster's Challenge Context T15 nodes are the minimum tier for the Grandmaster's Compass Challenge (the mid-Voyage competitive challenge). Running T15 content with competitive modifier configurations is the standard for this challenge.

Tier 16: The Finals Approach T16 is the last tier before the Maelstrom's Edge. T16 nodes are the highest-yield per-run content in the game (excluding pinnacle bosses). They are where the endgame's most optimized farming occurs — players who have built around T16 efficiency can clear one every 30-40 minutes with modified node configurations.

Progression gates:

T15 requires 10 T14 completions
T16 requires defeating 5 T15 bosses AND defeating any second-tier pinnacle boss (Leviathan or First Captain)

Economy integration:

T15-T16 drops set the ceiling of the player economy — items of this quality are the most traded valuable goods
Legendary Warrant configurations are primarily developed and traded by T16-focused players
The Uber boss access keys (from T15+ boss kills with modifiers) create a separate high-value trade market

The Maelstrom's Edge: Tier 17

Design intent: The ultimate standard content tier. T17 content is designed for players who have mastered everything below it and are looking for the game's hardest non-pinnacle content. T17 nodes are rare drops from T15-T16 completions and cannot be sustained by casual farming.

Content experience:

T17 nodes have unique rules not present at lower tiers:
- All monsters have a base empowerment that assumes Uncommon modifier investment
- The zone environment is always extreme (T17 nodes only generate in the most dangerous biome configurations)
- Bosses have access to two additional mechanics compared to their T15-16 equivalents
Item level is 84 (the maximum) — the best possible gear bases are only found here

Access to the Maelstrom After charting 20 T17 nodes and defeating all five standard pinnacle bosses, the Maelstrom Compass becomes craftable. The Compass requires all four pinnacle boss Compass Fragments — meaning the player must have defeated the Drowned Admiral, the Storm Sovereign, the Leviathan, and the First Captain. Once crafted, the Compass unlocks The Maelstrom encounter.

The Pinnacle Boss Progression

Pinnacle bosses represent the primary long-term combat goals of the endgame. Each has a full design in the Nautical Chart document; this section details their progression sequence and how they connect.

Access Timeline (Target Player Experience)

Boss	Recommended Tier	Typical Access Week	Notes
The Drowned Admiral	Tier 8-9	Week 3-4	First pinnacle — intro difficulty
The Storm Sovereign	Tier 9-10	Week 4-5	Parallel to Admiral — different access path
The Leviathan	Tier 12-13	Week 6-7	Second tier — significantly harder
The First Captain	Tier 13-14	Week 7-8	Parallel to Leviathan — different access path
The Maelstrom	Tier 17	Week 9-12	Ultimate encounter — requires all prior clears
Uber Drowned Admiral	Tier 15+	Week 8-10	Uber access opens after standard clear
Uber Storm Sovereign	Tier 15+	Week 8-10	As above
Uber Leviathan	Tier 16+	Week 10-12	Requires T16 investment
Uber First Captain	Tier 16+	Week 10-12	As above

The timeline above reflects a player engaging with the content at a serious but not obsessive pace. Dedicated players will progress faster; casual players will progress more slowly. Both are valid experiences.

Boss Progression Narrative Coherence

The five pinnacle bosses are not random challenges. They exist within the world's lore as specific entities with known histories, and defeating them changes the world:

Drowned Admiral defeated: The spectral fleet disperses. The sea zone previously dominated by ghost fleet patrols normalizes. A new permanent NPC appears in Ironport Crossing — a ghost who has finally found peace and remains as a spectral bartender, sharing historical lore that existed before the fleet's war.

Storm Sovereign defeated: The Eye of the Eternal Squall shrinks by 30% — the zone that was previously inaccessible becomes a new permanent chart node. Lore explains: the Sovereign was feeding on the storm. Without it, the storm is still there, but diminished.

Leviathan defeated: A deep-water chart node near the Leviathan's Furrow — previously blocked by the creature's territory — opens. The trench goes deeper than it did before the fight; the Leviathan's death disturbed ancient sediment layers.

First Captain defeated: The Last Flagship settles permanently into a stable drift path. It becomes a traversable environment between Voyages — a permanent chart node rather than an encounter zone. The First Captain's Orders (their unique drop) reveals the location of a hidden chart node not otherwise accessible.

The Maelstrom encounter completed: The Maelstrom collapses into a calm zone — the Sealed Waters, a new permanent chart node accessible only to characters who have completed the Maelstrom encounter on that Voyage. The Sealed Waters have unique chart drop tables and produce the game's most exclusive item components.

The Depth System: Infinite Progression

The Depth System is Salt & Steel's equivalent of PoE's Delve — an infinite progression system with no content ceiling, offering unique rewards and competitive depth leaderboards.

Core Concept

Beneath the surface of the sea, accessible through specific Trench Approach nodes on the Nautical Chart, lies the Abyssal Trench: a descent that goes deeper than any map has recorded. The Abyssal Trench is functionally infinite — there is no depth limit, only an exponentially increasing difficulty that eventually exceeds all but the most prepared captains.

The Trench is accessed via a diving mechanic that builds on Salt & Steel's standard underwater exploration but adds new systems for sustained deep operation.

The Diving Mechanics

Pressure Depth is measured in Fathoms. Every 100 Fathoms increases the ambient pressure. Characters have a Pressure Tolerance derived from their Constitution attribute and available pressure-resistance equipment. At maximum Pressure Tolerance, the character begins taking Pressure Damage — a continuous health drain that no healing can fully offset at extreme depths. Managing pressure is the Depth System's primary resource challenge.

Light Natural light fails at approximately 200 Fathoms. Below that, the character relies on bioluminescent creatures, their ship's lights (for zones near wreck content), and carried light sources (a consumable with limited duration). Operating in darkness reduces effective perception range, makes ambush encounters more common, and increases the chance of navigational errors that send the character into unintended cave systems.

Air Standard diving uses the oxygen timer from surface exploration. At depth, the timer is reduced by pressure (each additional atmosphere cuts effective air time by 10%). Crew members with the Diving Specialty can resupply air during extended dives via a carried tank system. Air management at extreme depths is a logistical challenge requiring pre-dive preparation.

The Submersible At Depth access, the character transitions from personal diving to piloting a Submersible — a small, pressurized vessel that descends far deeper than personal diving allows. The Submersible has its own hull integrity (separate from the main ship), its own equipment slots (lights, pressure resistance, weapon systems), and crew complement. It is the primary interface with the deep Abyssal Trench content.

The Submersible can be upgraded using materials found at depth — a parallel progression track to the main ship. Submersible upgrades improve:

Pressure ceiling (maximum accessible depth)
Light output (effective perception range in darkness)
Hull integrity (resistance to depth hazards)
Weapon effectiveness (damage to deep-sea creature types)
Crew capacity (more crew specialists can be brought on the dive)

Depth Content Structure

Shallows (0-500 Fathoms): The Abyssal Trench's accessible upper section. Manageable pressure, some natural light at the top, moderate creature difficulty. Content here is roughly equivalent to T8-T12 surface content in difficulty. Unique resources: Deep Coral, Pressure Glass, early Fossil materials.

The Twilight Zone (500-1500 Fathoms): Transitional depth. Natural light is gone. Pressure is significant. Content here is T13-T15 equivalent. Creature types become unusual — things adapted to pressure and darkness that have no surface equivalents. Unique resources: Depth Iron, Bioluminite, mid-tier Fossils, unique deep-sea crafting schematics.

The Midnight Zone (1500-3000 Fathoms): The deep endgame. Severe pressure, total darkness, creatures of extreme power. Content difficulty exceeds T16 surface content in most configurations. The Midnight Zone is where the depth system starts to differentiate between all but the most invested captains. Unique resources: Abyssal Alloy, Shadow Glass, high-tier Fossils, depth-exclusive Unique item components.

The Hadal Zone (3000-10000 Fathoms): The competitive leaderboard depth range. Only players with highly upgraded Submersibles and specialized builds for depth survival can reach this zone. Content difficulty scales to exceed any surface content equivalent. The Hadal Zone contains: depth-exclusive Unique items (not obtainable anywhere else), the deepest lore about the Collapse (recorded in ancient tablets left by the original civilization as they went below the surface), and an encounter type found nowhere else — The Deep Things. The Deep Things are not monsters. They are architectural: structures that move, shapes that are almost buildings, geometry that almost makes sense. They exist at extreme depth and their encounter type is "observation" — the player cannot fight them, only navigate near them carefully, because a The Deep Thing that notices the Submersible reacts with force sufficient to destroy any depth equipment in a single contact.

The Abyssal Plain (10000+ Fathoms): The theoretical maximum depth currently charted. Only a handful of captains across the entire server have reached 10000 Fathoms. The rewards here are extraordinary; the content is correspondingly lethal. The competitive leaderboard tracks maximum depth reached and maximum depth reached without Submersible hull damage — two separate metrics that reward different styles of deep diving.

Depth Sustain

Unlike chart nodes, depth content does not require items to access — the Submersible descends and the player proceeds until they choose to surface or are forced back. The resource cost of depth diving is:

Sulphite equivalent (a fuel material called Deep Silt, gathered at the surface layer of the Trench and in certain chart nodes) — consumed per 100 Fathoms of descent
Submersible hull integrity loss (repaired in port, using standard ship-repair currency)
Consumable light sources (consumed during Midnight Zone+ dives)

Deep Silt is the primary throttle on depth progression — players can only descend as far as their Silt supply allows. Gathering more Silt requires chart node farming, creating a natural loop between surface chart content and depth progression.

The Depth Leaderboard

The competitive depth leaderboard tracks:

Maximum Depth Reached (Lifetime): The deepest a character has descended on the current Voyage — the primary competitive metric
Maximum Depth Reached (Clean): Maximum depth without any Submersible hull damage during the dive — a purity metric for precision divers
Deepest Boss Killed: The depth at which the highest-tier boss was defeated — rewarding combat in addition to exploration
Speed Descent: Fastest time to reach 1000, 3000, and 5000 Fathoms — a speed metric for optimized descent builds

Leaderboard standings reset per Voyage. Lifetime records are maintained on the Account Record for prestige display.

Endgame Build Specializations

The endgame's three major activities — chart farming, pinnacle boss encounters, and depth diving — are aligned with distinct character build philosophies. Ideally, a character can specialize in one while remaining capable of participating in the others, though peak efficiency in each requires meaningful investment.

The Chart Farmer

Design profile: Maximum loot density, high clear speed, excellent modifier handling. This character prioritizes:

GURPS skills: Tactics (combat efficiency), Cartography (additional loot reveals), Trade (economy integration)
GURPS advantages: Combat Reflexes (aggressive clear speed), High Pain Threshold (surviving modifier damage), Fearlessness (running maximum modifier configurations without combat anxiety penalties)
Ship upgrades: High cargo capacity, fast sail settings for efficient chart transit, crew with Rigging specializations for speed

Chart tree investment: Treasure Hunting and Monster Hunting branches — maximizing yield per run.

The Boss Hunter

Design profile: Peak single-target damage, precise combat mechanics, excellent boss pattern execution. This character prioritizes:

GURPS skills: Swordsmanship or Musketry at maximum (chosen weapon specialization), Tactics (reading multi-phase boss encounters), Occultism (interacting safely with supernatural boss phases)
GURPS advantages: Combat Reflexes (initiative in boss encounters), Danger Sense (early warning on boss mechanics), High Pain Threshold (sustaining in extended boss fights)
Ship upgrades: Cannon accuracy, crew with Combat specializations for boarding-action boss phases

Chart tree investment: Boss Farming branch entirely — reducing access costs, increasing boss drop rates, enabling Uber boss access.

The Deep Diver

Design profile: Maximum pressure tolerance, efficient air management, Submersible specialization. This character prioritizes:

GURPS skills: Seamanship (Submersible handling at depth), Natural Philosophy (understanding depth creature behavior), Navigation (depth navigation in darkness)
GURPS advantages: High Pain Threshold (sustaining pressure damage at extreme depths), Danger Sense (avoiding The Deep Things), Night Vision (partial effectiveness even at total darkness depths)
GURPS disadvantages that unexpectedly work well here: Greed (must pass Will roll to not collect every deep resource — which means they always stop for resources), Curious (mandatory investigation of unusual structures at depth — which is exactly what deep diving rewards)
Ship upgrades: Submersible hull plating, pressure resistance equipment, extended light system

Chart tree investment: Supernatural Exploration branch — depth content has significant supernatural overlap at extreme fathoms.

Endgame Milestones Summary

Milestone	Tier/Content	Approximate Week	Unlock
Chart Access	Campaign complete	Week 0	Nautical Chart, T1-T5
First Charted Node	T1 complete	Week 0	Character seal on Chart
Harbormaster Met	10 T1-T5 completions	Week 1	Invitation system, T6-T10
Open Sea Access	T6 unlocked	Week 1-2	T6-T10 tier range
First Legendary Encounter	T5+	Week 2-3	Legendary zone variant node
First Pinnacle Access	15 T6-T10 completions	Week 3-4	Drowned Admiral / Storm Sovereign
First Pinnacle Boss Kill	T8-10 content	Week 3-5	Compass Fragment 1, T11-T14
Dangerous Waters	T11 unlocked	Week 4-6	Supernatural weather, T11-T14
Second Pinnacle Tier	20 T11-T14 completions	Week 6-8	Leviathan / First Captain access
Third Pinnacle Boss Kill	T12-14 content	Week 7-9	Compass Fragment 3, T15-T16
The Outer Reaches	T15 unlocked	Week 7-9	Legendary Warrants available
Full Pinnacle Progression	All 4 standard Pinnacles	Week 8-10	Maelstrom Compass craftable
The Maelstrom	T17 × 20, all Fragments	Week 9-12	Ultimate encounter
First Depth Dive	Trench Approach access	Week 4-6	Abyssal Trench, Shallows
Midnight Zone	1500 Fathoms	Week 6-10	Depth-exclusive content
Competitive Depth	3000+ Fathoms	Week 8-12	Leaderboard competition
Uber Pinnacle	Post-standard clear, T15+	Week 8-12	Uber-exclusive drops
40/40 Challenges	All challenges	Week varies	Server-wide announcement, account mark

Anti-Stagnation Design: Keeping the Endgame Fresh

The endgame must remain compelling across 13 weeks of a Voyage for its most engaged players. Several systems combat natural progression plateau:

The Weekly Rotation The Speed Charting Circuit (five weekly nodes with competitive times) provides a fresh competitive challenge every week. Players who have completed their primary progression goals can engage with the Circuit as an ongoing competitive activity.

The Modifier Meta The optimal modifier configuration for farming efficiency shifts throughout a Voyage as drop rates are adjusted and new discoveries are made by the community. Players who follow and contribute to this meta evolution find ongoing engagement in optimization.

The Depth Progression Depth diving has no ceiling in meaningful content for the current period. A player who reaches their maximum depth capacity at week 6 has a clear upgrade path (Submersible improvements) that extends their effective depth range by weeks 9-12.

Build Experimentation With a Voyage character who has reached plateau efficiency on their primary build, the endgame provides excellent conditions for alt-character exploration (a second Voyage character on the same account, starting fresh but with the player's accumulated knowledge). The economic conditions of a mature Voyage market allow alt characters to be geared rapidly, enabling different build experiences within the same Voyage.

The Captain's Legacy Goals Account-level progression goals (the Voyage completion history, faction standing, the Cartographer's Atlas) provide ongoing motivation that transcends any single character's plateau. Players who approach a character ceiling may shift their focus from that character's power to the account's legacy — charting nodes for the Atlas, building faction standing, completing challenges they set aside during optimization.

See also:
Nautical Chart — the full Chart system, node types, modifiers, and pinnacle boss design
Voyage System — seasonal structure and Captain's Legacy integration
GURPS Framework — how character build connects to endgame specialization
Monsters & Encounters — pinnacle boss mechanics in full detail
Naval Systems — naval combat integration with chart content