Combat and raids

Fortress (skilling raid)

A five-player skilling raid. Each player gathers and processes resources to feed one army stat while endless waves attack. Its only XP is Fortify XP, paid per action and as a bonus at the end of the run.

See it on the systems map

Rules and numbers

1. observed The Fortress is open to any player, but a low-level player will not do well in it.
   Source: player report, 2026-10-03; raids.json (slayLevelRequired 1)
2. confirmed There are five roles, each a gather/process pair feeding one army stat: fish/cook to Health, mine/smith to Melee, forage/craft to Range, invoke/imbue to Magic, and farm/brew to Defense.
   Source: Constants.js:4358-4373
3. confirmed The first wave arrives at 2:00, then one every 20 s on a fixed clock; the armies trade damage every 1.5 s.
   Source: Constants.js:4375-4392
4. confirmed A wave still alive when the next is due reinforces it, and the run ends (paid like a wipe) the moment a third wave arrives on a standing stack.GAUNTLET_STACK_CAP = 3
   Source: Constants.js:4515-4525
5. confirmed Actions run at 10x speed, and army stats start at 10.actionTime = finalDuration / 10 (GAUNTLET_HASTE)
   Source: Constants.js:4434-4440, 4490
6. confirmed A processed item of tier T deposits round(2*1.35^T) stat points; raws deposit at a third of their value, rounded down.deposit = round(2 * 1.35^T); rawDeposit = floor(deposit/3)
   Source: Constants.js:4484, 4492-4500
7. confirmed Fortify XP per action is 1 + 0.36 x wave (wave floored at 1), and a failed action pays 25%; the underlying gather or process skill earns nothing.fortifyXP = (1.0 + 0.36*max(1,wave)) * (success ? 1 : 0.25)
   Source: Constants.js:4441-4468
8. confirmed The run-end bonus is waves survived squared (wave 20 = 400, wave 100 = 10,000), paid once per player on any exit and never to clones.completionXP = round(wavesSurvived^2)
   Source: Constants.js:4469-4481
9. dev note Fortify XP is banked and arrives in one lump when you turn in a bag.
   Source: LoginScreen.js:104 (patch note)
10. confirmed Enemy health is 32 x n x 1.039^n, times 1.55 per 20-wave section, easing to 1.022 growth and a 1.06 step after wave 100; attack is n x 1.06^n split across three typed lanes.health = round(32*n*growth(n)*1.55^min(5,section)*1.06^max(0,section-5)); attack = round(n*1.06^n); defense = round(1.5*n)
    Source: Constants.js:4594-4607
11. confirmed Every 20 waves survived banks one common roll from the next dungeon tier's table, scaled by your share of deposits (min 5%) and by Luck and Fortify milestones; each clone costs the host 5% of contribution.
    Source: Constants.js:4609-4621, 4634-4643

More in Combat and raids

Ancient and Chaos shards and slates · Chaos Dungeon · Combat · Combat styles and Life/Spirit · Corruption · Death · Delve (combat raid skill and tree) · Dungeons (tiered raids) · Fortify talent tree · Fortress Ledgers and Banners · Fortress rares · Raid wave respawn · Slay masters · Slay tasks

Statuses: confirmed is a value or rule in the game files; observed is measured from recorded play; dev note comes from a developer comment, tooltip or patch note; inferred is worked out from the files with the assumption stated; unknown is decided on the server. Game data read 2026-10-03.