Slayer

combat

Defeat bosses and elites to increase Slayer mastery across your account. From 10% Slayer, boss and elite attacks do less damage to you, your mercenaries, and your summons. At 100%, the reduction is 10%.

At 100%, you unlock the Slayer Master achievement.

Bestiary Discoveries and Slayer

1
Find a boss or an elite.

Only these 143 targets give Slayer mastery. When you come near one, your Bestiary adds it with zero kills.

Finding a boss does not reveal its drops. You discover loot separately.
2
Kill the target.

The player who drew the most of the monster's attention gets kill credit. In a party, each nearby member also gets credit.
3
Collect the mastery.

Each credited kill adds 0.02% to account Slayer. Only the first 50 kills of each target count. After that, find a new target.
4
Take less damage.

From 10% mastery, every boss and elite deals less damage to you. The reduction grows to 10% at full mastery.

Damage reduction

Below 10% Slayer, boss and elite hits deal full damage. At 10% Slayer, a 100-damage hit loses 1 damage. At 100%, it loses 10. Armor Class and elemental resistance reduce the remaining damage.

Slayer mastery 10%

Damage reduction

At 10% mastery, a boss or elite deals 1.0% less damage to you.

Exact damage rule

At 10% Slayer, a boss or elite hit loses 1% of its damage, rounded up. Each additional 10% Slayer adds another 1% reduction, up to 10%. Even a 10-damage hit loses 1 damage.

A mercenary or summon uses the Slayer mastery of its owner.

Account-wide mastery

The game adds the capped kills of every character on the account, then stops Slayer at 100%. One target adds at most 1% mastery, so 100% needs kills from a minimum of 100 targets.

Target contribution: Adds 0.02% Slayer mastery per kill of that target on your account, at most 1% per target, reached at 50 kills
Slayer mastery: Every target's contribution added together, at most 100%

Example ,30 targets with 50 or more kills,120 kills on targets with fewer than 50 kills

32.4% Slayer mastery

Targets at the limit: 30 × 1% = 30%

Other kills: 120 × 0.02% = 2.4%

Slayer mastery: 30% + 2.4% = 32.4%, at most 100%

A mercenary or summon that draws the most attention gives kill credit to its owner. In a party, each nearby member gets the same credit.

The Bestiary count stays with one character. Slayer mastery is the total for the account, and every race starts at 0%. A kill after the 50-kill limit still increases the Bestiary count, but not Slayer mastery.

Slayer targets

Only bosses and elites give Slayer mastery. Regular monsters and hunt targets do not.

			Map	Zone			Requirement
Elite	Gukavep	9+	Map	Twilight Forest	8m	-	-
Boss	The Archon	9+	Map	Lost Archives	20m	-	Blocked while 8 Constructs alive
Elite	Elder King	10+	Map	Twilight Forest	8m	-	-
Boss	Infernal Skeleton	10+	Map	Crypt of Decay	10m	-	-
Boss	Archivist Phaendar	12+	Map	Lost Archives	1h	-	-
Boss	Lord Darish	12+	Map	The Lone-lands	30m	-	-
Boss	Xylevis	12+	Map	Crescent Coast	30m	-	-
Elite	Sergeant Gaeleath	13+	Map	The Forgotten Catacombs	30m	-	-
Boss	Captain Aerendyl	14+	Map	The Forgotten Catacombs	30m	-	-
Elite	Skarr Brute	14+	Map	The Molten Summit	20m	-	-
Elite	Summoned Elemental	16+	Map	Despair	10m	-	-
Boss	Herald of Destruction	20+	Map	Despair	30m	-	-
Elite	Slime King	20+	Map	Varensea Island	10m	50%	-
Elite	Shadow Weaver	21+	Map	Lizardmen's Den	1h	-	-
Elite	Guardian Gairzag	22+	Map	Lizardmen's Den	1h	-	-
Boss	High Priestess Kaex	22+	Map	Lizardmen's Den	1h	-	-
Boss	Ancient Spirit	25+	Map	Abandoned Mines	1h	-	-
Elite	Angry Treant	25+	Map	Twilight Forest	30m	50%	-
Boss	Bane Killoran	25+	Map	The Forgotten Catacombs	1h	-	-
Elite	Forsaken Skeleton	25+	Map	Crescent Coast	30m	75%	-