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Alchemical Hydra
The Slayer capstone
A four-phase Slayer boss requiring a hard task unlock. Rewards the brimstone ring and hydra leather for the best boots in the game.
At a glance
- Requirement
- 95 Slayer (on task) To start
- Rec. combat
- 95+
- Profit
- 4.1m/hr 25 kills/hr · verified
- Difficulty
- Advanced 1,100 HP · max 26
- Best style
- Ranged / Magic
- Chase drops
- Hydra's claw, Hydra leather Why go
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Should you fight this?
What you get out of Alchemical Hydra, so you can decide if it fits your goals right now.
- Only source of hydra leather → Ferocious gloves (melee BiS).
- Brimstone ring is a versatile all-style ring upgrade.
- Strong Slayer gp and consistent alchemicals per task.
- Dragon hunter lance/crossbow shred its dragon typing.
How to get there
The best ways to reach Karuulm Slayer Dungeon (Alchemical Hydra) (for Alchemical Hydra) in Kebos Lowlands. Requirements are checked against your account on the readiness panel above.
Rada's blessing 3/4 → Mount Karuulm
- 1Use the Mount Karuulm option on Rada's blessing 3 or 4 to arrive at the dungeon.
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3 alternative routes
Battlefront Teleport → run north
- 1Use a Battlefront Teleport, landing just south-east of Mount Karuulm.
- 2Run to the dungeon.
Fairy ring CIR → walk north
- 1Travel with fairy ring code CIR.
- 2Walk north to Mount Karuulm and descend.
Skills necklace → Farming Guild, run
- 1Rub a Skills necklace to the Farming Guild.
- 2Travel to just south-west of Mount Karuulm.
Gear setups
Pick the setup that matches your bank. Every upgrade here links back to the Gear hub.
Upgrade paths for this fight
Strategy
- 1
Bring dragonbane and boots
It's a dragon, so a Dragon hunter lance or crossbow shreds it. Wear boots of stone/brimstone/granite for the lava floor (unless you've finished the Elite Kourend & Kebos Diary).
- 2
On a hydra task only
The Alchemical Hydra can only be fought while on a hydra Slayer task assigned by Konar — you can't fight it off-task.
Key mechanics
What can kill you at Alchemical Hydra, and what to do about it. For the full breakdown, see the OSRS Wiki link below.
Phase prayer switching
It alternates ranged and magic every three attacks for the first three phases — swap Protect from Missiles/Magic to match; the final phase alternates every attack, faster.
Chemical vents
At each phase change it gains 75% damage reduction — lure it onto the matching floor vent to strip the shield; the wrong vent raises its damage by up to 50%.
Ground hazards
It leaves poison pools (green/black), lightning (blue) and fire (red) on the floor — all avoidable, so keep stepping off them.
Notable drops
| Item | Rarity | Value |
|---|---|---|
 Hydra's clawUnique | 1/1000 | 46.3m |
 Hydra leatherUnique | 1/514 | 9.1m |
 Hydra tail | 1/512 | 82k |
.png) Dragon knife (piece) | Common | 3.4k |
 Jar of chemicals | 1/2000 | 76.1k |
 Ikkle hydra pet | 1/3000 | — |
Drop probability by KC
For every Alchemical Hydradrop with a fixed rate, see the chance you’ve received at least one copy by your kill count. Sign in with a linked account to use your live KC.
Enter your KC to see the chance you’ve seen each drop at least once.
| Drop | Rate | Chance by KC |
|---|---|---|
| Hydra's claw Unique | 1/1000 | — |
| Hydra leather Unique | 1/514 | — |
| Hydra tail | 1/512 | — |
| Dragon knife (piece) | Common | — |
| Jar of chemicals | 1/2000 | — |
| Ikkle hydra pet | 1/3000 | — |
These figures are an independent-roll estimate: they treat every kill as a separate roll at the listed rate ( 1 − (1 − p)KC). Real drops can involve guaranteed rolls, point/invocation scaling or completion rewards, so the true odds may differ. A probability is never a guarantee — even far above 90%, the drop is never owed to you. Drops without a fixed 1/Nrate show “—”.
Progression after this boss
Once Alchemical Hydra feels comfortable, these are the natural next steps up in difficulty and payout.
Frequently asked questions
How much gp/hr is Alchemical Hydra in OSRS?
Alchemical Hydra earns approximately 4.1m per hour at around 25 kills/hour, based on the OSRS Wiki money making guide. Rates vary with gear and experience.
What are the requirements for Alchemical Hydra?
Alchemical Hydra requires 95 Slayer and Boots of stone / brimstone / granite.
What combat level do you need for Alchemical Hydra?
A combat level of 95+ is recommended for Alchemical Hydra.
What combat style is best for Alchemical Hydra?
Alchemical Hydra is best fought with Ranged and Magic.
How hard is Alchemical Hydra?
Alchemical Hydra is an Advanced-tier boss with 1,100 hitpoints and a max hit of 26.
What does Alchemical Hydra drop?
Notable drops from Alchemical Hydra include Hydra's claw and Hydra leather.