Alchemical Hydra

One of the highest-earning solo bosses in the game, with a four-phase fight and a valuable, consistent drop table.

MembersAdvancedLow riskHands-on

The Alchemical Hydra is the most rewarding Slayer boss in the game and the most demanding. Four phases, each with a different attack style and its own hazard, and a rotation that punishes standing in the wrong place more than it punishes poor gear.

Boots of stone are required to walk the Karuulm dungeon floor at all. Without them the walk in costs more health than the fight does.

Value is concentrated in the rare drops — the claw, the eye and the heart — which means the variance is enormous. Two hours can produce nothing; the third can produce more than a week of anything else.

A hydra Slayer task is required, so this cannot be farmed on demand. Extending the task is how most players get a meaningful run at it.

What you actually do

1Take a hydra Slayer task and travel to the Karuulm Slayer Dungeon.
2Fight through the four phases, switching prayer as each phase changes attack style.
3Move away from the chemical pools and the fire walls rather than tanking them.
4Bank between kills.

Getting the most from it

Boots of stone are needed to walk the dungeon floor without taking constant damage.
Each phase changes the attack style. Learning the four transitions is the whole fight.
The rare drops are where the value is concentrated, so this is a method to judge over many hours.