Alchemical Hydra: how to defeat it (Ironman guide)

Tier

Late

Combat level

426

Style

Ranged

Requirements

95 Slayer + Hydra task. Boots of stone/brimstone. Ranged (Bowfa/Blowpipe)

Why kill it as an Ironman

Dragon hunter lance, Ferocious gloves, Brimstone ring, Hydra leather, lots of gold. Hydra bones.

Loot

The live drop table (wiki rates) and the drop simulator are in the app. ⚔ Open in the interactive guide

Level 95 Slayer boss in the Karuulm Slayer Dungeon (Hydra task). 4 phases of 25%: in the first 3 you must lure it onto the right vent or it reduces your damage by 75%. Only magic and ranged; in the last phase it alternates every attack.

Left icon: what hits you. Right icon: what to pray.

→🔄

Style switch

In the first 3 phases it switches style every 3 attacks and sways its heads back as the cue. Switch prayer then. Each phase starts with 3 basic attacks, then the special.

⚠→🚫

Green: poison

Lure it to the red vent (south-east). After 3 attacks it throws poison pools around you (12 per tick if you stand in them): run north on its 4th attack.

⚠→🚫

Blue: lightning

Lure it to the green vent (north-east). 4 lightning currents from the corners converge on you (22 and a bind): run west along the north wall.

⚠→🚫

Red: fire

Lure it to the blue vent (north-west). It walks to the centre, stuns you, drops fire walls at your sides and a tracking flame: turn run off and walk in a straight line (25 plus burn).

→🔄

Grey: enrage

No vent needed. Attacks every 4 ticks alternating magic and ranged (max 55), starting with the opposite of the last phase. Switch prayer every attack; poison on the 4th and every 9 after.

1. Run north past the Tasakaal and east past the Hydras (or the pipe with 88 Agility). It is instanced: if you die, Orrvor quo Maten holds your items for 100k.
2. Wait next to the red vent (east) so it lands on it by itself on spawn. Use your defence-lowering special (BGS/DWH) while waiting for the first vent.
3. Green to red vent, blue to green vent, red to blue vent. Every 25% it loses a head and changes colour.
4. Pray by style; use damage specials in the red phase to skip the fire walls.
5. Grey phase: alternate prayer every attack until it dies. Swap to a Bracelet of slaughter here if extending the task.

Slayer helmet (i)Bow of FaerdhinenCrystal bodyCrystal legsNecklace of anguishAva's assemblerBoots of Brimstone

Typical inventory

2

8

8

Toxic blowpipe · Ranging potion(4) x2 · Prayer potion(4) x8 · Antidote++(4) · Shark x8 · Teleport to house (tablet) · Rune pouch

• 💡 Weak to ranged. If meleeing use a Dragon hunter lance on stab. No magic (260 Magic).
• 💡 With practice you barely take damage: swap food for prayer potions. A Bonecrusher necklace buries hydra bones and gives 8 Prayer per kill.
• 💡 Cooked moonlight antelope cures poison and saves the antipoison. Rada's blessing 4 for a fast return if using Bowfa or blowpipe.

Tap a video to play it. Source: OSRS Wiki (CC BY-NC-SA 3.0).

▶ Video