Combat and raids

Slay masters

Six masters, one per mob tier, set the pool future slay rows roll from. Each unlocks at a slay level; the Chaos master pulls from every tier and doubles loot and corruption.

See it on the systems map

Rules and numbers

confirmed Masters and their unlock levels: Valthor (Feeble, Slay 1), Seraphine (Dire, 30), Draven (Savage, 50), Morwenna (Fell, 70), Varyndra (Chaos, 75) and Azrathel (Ancient, 90).
Source: MobSelectionModal.js:43-48; SlayQueuePanel.js:80-85, 590
confirmed The game data has 74 slay encounters: Feeble 17 (slay 1-28), Dire 13 (30-48), Savage 16 (50-69), Fell 10 (70-89), Ancient 6 (90-99) and Chaos 12 (100-110).
Source: mobs.json (encounters.slayRequired)
confirmed Chaos mobs also need two related skills at 90 (or Alms/Luck 99), and the Chaos Furious Slime needs 2,700 total level.
Source: mobs.json (skillRequired, totalLevelRequired); Constants.js:2239-2242
dev note Varyndra's pool is every slayer creature, filtered by your slay level, so she unlocks at 75 although her own Chaos mobs need slay 100.
Source: MobSelectionModal.js:570
confirmed On a Varyndra task, total corruption chance is doubled, loot rolls are doubled, and each queue weight pip counts double (1.25^2 per pip); Slay XP is not doubled.corruption = 2 * (base + idols + Delve tree); weight = 1.25^(2*lever)
Source: Constants.js:4996-5007
confirmed Assigning a master does not pull a task; it sets the master that future queue rolls come from.
Source: MobSelectionModal.js:520-522; LoginScreen.js:186 (patch note)
confirmed The queue's master picker only offers masters you have the slay level for.
Source: LoginScreen.js:58 (patch note); SlayQueuePanel.js:590-625

Connected systems

Slay masters double the chance of (Chaos) Corruption
Slay masters double the lever pips of (Chaos) Skill, activity and node levers
Slay masters assign Slay tasks
Task queue picks a master from Slay masters
Task roll draws mobs from Slay masters
Slay masters gate the Furious Slime by Total level

Arrows show who acts on whom: → this system acts on the other, ← the other acts on this one, ↔ both do.

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 (skilling raid) · Fortress Ledgers and Banners · Fortress rares · Raid wave respawn · 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.