Alchemical Hydra | OSRS Index

This fight takes place in an instance with a deathbank.

100,000 to retrieve lost items.
Any unsafe death will delete all items left inside the deathbank. Any items left on the ground will be lost.

This article has a strategy guide.

All information on mechanics and strategy will be on this page.

This article has a Slayer task guide here.

Information comparing locations for Slayer tasks will be on this page.

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Alchemical Hydra



Released		10 January 2019 (Update)
Members		Yes
Combat level		426
Size		6x6
Examine		A ferocious Alchemical Hydra!
League region		Kourend✓

Combat info

Attribute		Draconic
XP bonus		+20%
Max hit		17x2 (default) 26x2 (empowered)
Aggressive		Yes
Poisonous		Yes
Attack style		Ranged, Magic
Attack speed		6 ticks (3.6 seconds)
Respawn time		43 ticks (25.8 seconds)

Slayer info

Slayer level		95
Slayer XP		1,320 xp
Category		Hydras, Bosses
Assigned by

Combat stats


1,100	100	100	100	260	260

Aggressive stats


+0	+0	+45	+20	+45	+20

Melee defence


+75		+150		+150

Magic defence


+150			50% weakness

Ranged defence


+45		+45		+45

Immunities

Poison		100% resistance
Venom		100% resistance
Burn		Not immune

Open in DPS calculator
Advanced data

Monster ID		8615,8616
Link		MOID

The Alchemical Hydra is a boss version of hydra, found in the lower level of the Karuulm Slayer Dungeon in Mount Karuulm, requiring level 95 Slayer to kill. The Alchemical Hydra was the creation of a Dragonkin named Karuulm. While Karuulm saw promise in his creation, he nevertheless saw it as a failure because he could not replicate its traits, and abandoned it along with his other creations: the Wyrms, Drakes, and Hydras.

Unlike normal hydras, the Alchemical Hydra can only be killed while on a hydra Slayer task, which are only assigned by Konar quo Maten and Mortimer. Likewise, it can be assigned for boss slayer, but only by Konar.

In addition, as it is found within the volcano, players who have not completed the elite Kourend & Kebos Diary must wear boots of stone, boots of brimstone, or granite boots to protect themselves from the extreme heat of the dungeon floor. This also applies to attempting to use the Item Retrieval Service, where the rapid damage will interrupt actions and dying a second time will wipe the storage.

Along with all the unique drops obtainable from hydras, it can also drop hydra leather, which is used on the machinery south-west of the pool in the Lithkren Vault to create ferocious gloves, as well as the hydra claw, which is combined with a Zamorakian hasta to create the dragon hunter lance.

Location

Location	Levels	Members	Spawns	Map	League region
Karuulm Slayer Dungeon (lower level)	426		1	Show map	Kourend✓

The Alchemical Hydra can be found in the lower level of the Karuulm Slayer Dungeon. Its lair is at the northern side of the dungeon, past the Tasakaal and then east past the hydras chamber. Orrvor quo Maten will be found guarding the entrance of the lair. Alternatively, with level 88 Agility the mysterious pipe shortcut just behind Kaal-Ket-Jor may be used to reach the lair safely.

Fight overview

	Alchemical Attack!
The music which plays when fighting the Alchemical Hydra.

The player fights the Hydra in an instanced room upon jumping over the rock barrier. The chamber consists of two rooms; an observation room which is safe from the Hydra, and a set of doors leading into the test chamber where the Hydra resides. The Hydra will become aggressive and attack upon entering the test chamber, and the doors will also lock themselves. This means that the only means of escape are to either kill the boss, die, or teleportation. Players cannot log themselves out of the test chamber either.

The Alchemical Hydra has four phases throughout the fight, depending on its remaining health. It attacks with Ranged and Magic, alternating between them every three attacks for the first three phases. At the start of each phase, it has a 75% damage reduction, which can be removed if it is lured over a vent on the floor which spews chemical liquid. However, the vent must be the correct one, corresponding to the combat triangle (e.g. when it is green, red will weaken it), otherwise the Hydra's damage is increased by up to 50%.

When the Alchemical Hydra reaches or falls below 75%, 50%, and 25% of its health (that is, at 825, 550, and 275 Hitpoints), it will lose one of its heads and begin the next phase. Barring the last phase, the damage reduction is reapplied, and so it should be lured over the next vent. It also has special attacks for each phase: poison pools when green and black, electricity when blue and fire when red. These special attacks are avoidable.

In its final phase, the Hydra will alternate combat styles every attack with increased attack speed and max hit. Its first attack will always be the opposite style to what it most recently used (e.g if its last attack in phase 3 was ranged, it will start phase 4 with magic).

When the Hydra is killed, it will respawn in approximately 25 seconds, and the doors will unlock during this time.

Money making

The following money making guide is available for Alchemical Hydra:

Method	Hourly profit	Skills
Killing the Alchemical Hydra	4,072,535	95 required 75+ recommended 74+ recommended 85+ recommended

Drops

In addition to the 100% drop, the player will also have two rolls on the Alchemical Hydra's drop table. The first drop has a chance to be a unique, while the second is always standard. The drop rates in the drop table below reflect the chance of getting an item for every roll on the standard loot table. For example, a listed drop rate of 2 x 2/100 indicates that you have two 2/100 chances of receiving that item.^[1]

Drops remain on the ground for 3 hours, or until the player leaves the instanced area.^[2]

Drop rates are estimated based on 292,738 samples from the Drop Rate Project, unless otherwise cited.

The average Alchemical Hydra kill is worth 190,381.3.

The average Alchemical Hydra kill while on a Konar task is worth 192,538.77.

100%

	Item	Quantity	Rarity	Price	High Alch
	Hydra bones	2	Always	14,852	192

Pre-roll

There is approximately a 1/87.6 chance to hit this table.^[3]

Item	Quantity	Rarity	Price	High Alch
Hydra's eye	1	1/181.1^{[d 1]}^[4]	Not sold	60,000
Hydra's fang	1	1/181.1^{[d 1]}^[4]	Not sold	60,000
Hydra's heart	1	1/181.1^{[d 1]}^[4]	Not sold	60,000
Hydra tail	1	1/513^[4]	99,022	60,000
Hydra leather	1	1/514^[4]	12,259,144	60,000
Hydra's claw	1	1/1,001^[4]	48,810,952	90,000
Dragon thrownaxe	500–1,000	1/2,000^[4]	201,000–402,000	225,000–450,000
Dragon knife	500–1,000	1/2,001^[4]	2,039,500–4,079,000	50,000–100,000

^ ^1.0 ^1.1 ^1.2 The order in which players receive the items is: Hydra's eye, Hydra's fang and finally Hydra's heart.

Weapons and armour

Item	Quantity	Rarity	Price	High Alch
Mystic fire staff	1	2 × 8/101^{[d 1]}	25,087	25,500
Mystic water staff	1	2 × 8/101^{[d 1]}	24,819	25,500
Battlestaff	8–12 (noted)	2 × 5/101	57,664–86,496	33,600–50,400
Black d'hide body	1	2 × 5/101	7,248	8,088
Dragon longsword	1	2 × 3/101	59,058	60,000
Dragon med helm	1	2 × 3/101	58,453	60,000
Rune platebody	1	2 × 3/101^{[d 2]}	38,521	39,000
Dragon battleaxe	1	2 × 2/101	119,201	120,000
Rune platelegs	1	2 × 1.5/101^{[d 2]}	37,824	38,400
Rune plateskirt	1	2 × 1.5/101^{[d 2]}	38,040	38,400
Mystic robe top (light)	1	2 × 1/101^{[d 3]}	71,080	72,000
Mystic robe bottom (light)	1	2 × 1/101^{[d 3]}	47,797	48,000

^ ^1.0 ^1.1 Players will receive Mystic fire staff together with Mystic water staff
^ ^2.0 ^2.1 ^2.2 Players will receive Rune platebody together with Rune platelegs or Rune plateskirt
^ ^3.0 ^3.1 Players will receive Mystic robe top (light) together with Mystic robe bottom (light)

Runes and ammunition

Item	Quantity	Rarity	Price	High Alch
Chaos rune	150–300	2 × 6/101	15,900–31,800	8,100–16,200
Death rune	150–300	2 × 6/101	28,200–56,400	16,200–32,400
Blood rune	150–300	2 × 6/101	56,250–112,500	36,000–72,000
Astral rune	150–300	2 × 6/101	15,000–30,000	4,500–9,000
Dragonstone bolts (e)	100–120	2 × 2/101	38,400–46,080	63,700–76,440
Onyx bolts (e)	35–50	2 × 1/101	294,455–420,650	315,000–450,000

Herbs

There is a 10/101 chance to get noted herbs.

Item	Quantity	Rarity	Price	High Alch
Grimy avantoe	10–15 (noted)	2 × 1/64.6	13,620–20,430	100–150
Grimy kwuarm	25–30 (noted)	2 × 1/64.6	46,350–55,620	300–360
Grimy ranarr weed	10–15 (noted)	2 × 1/80.8	52,700–79,050	180–270
Grimy snapdragon	10–15 (noted)	2 × 1/80.8	73,340–110,010	120–180
Grimy cadantine	25–30 (noted)	2 × 1/80.8	52,875–63,450	325–390
Grimy dwarf weed	25–30 (noted)	2 × 1/80.8	33,625–40,350	350–420
Grimy lantadyme	25–30 (noted)	2 × 1/107.7	30,850–37,020	325–390
Grimy torstol	10–15 (noted)	2 × 1/107.7	29,920–44,880	150–225

Seeds

There is a 2/101 chance of rolling the tree-herb seed drop table.

Item	Quantity	Rarity	Price	High Alch
Ranarr seed	2–3	2 × 1/420.8	56,738–85,107	60–90
Snapdragon seed	2–3	2 × 1/450.9	90,596–135,894	72–108
Torstol seed	2–3	2 × 1/573.9	31,666–47,499	84–126
Watermelon seed	30–45	2 × 1/601.2	6,960–10,440	990–1,485
Willow seed	2–3	2 × 1/631.3	106–159	18–27
Mahogany seed	2–3	2 × 1/701.4	412–618	56–84
Maple seed	2–3	2 × 1/701.4	6,770–10,155	56–84
Teak seed	2–3	2 × 1/701.4	134–201	56–84
Yew seed	2–3	2 × 1/701.4	38,638–57,957	170–255
Papaya tree seed	2–3	2 × 1/901.8	2,720–4,080	138–207
Magic seed	2–3	2 × 1/1,147.7	141,358–212,037	506–759
Palm tree seed	2–3	2 × 1/1,262.5	32,710–49,065	304–456
Spirit seed	2–3	2 × 1/1,578.1	Not sold	0
Dragonfruit tree seed	2–3	2 × 1/2,104.2	268,902–403,353	516–774
Celastrus seed	2–3	2 × 1/3,156.3	33,946–50,919	648–972
Redwood tree seed	2–3	2 × 1/3,156.3	28,414–42,621	780–1,170

Other

Item	Quantity	Rarity	Price	High Alch
Coins	5,550–25,550	2 × 0.5/101	5,550–25,550	5,550–25,550
Coins	40,000–60,000	2 × 9.5/101	40,000–60,000	40,000–60,000
Shark	2–4	2 × 7/101	2,058–4,116	204–408
Ranging potion(3)	1	2 × 7/101^{[d 1]}	1,397	172
Super restore(3)	2	2 × 7/101^{[d 1]}	14,564	288
Dragon bones	30 (noted)	2 × 6/101	99,930	2,880
Crystal key	1	2 × 1/101	20,183	90

^ ^1.0 ^1.1 Players will receive Ranging potion(3) together with two Super restore(3)

Rare drop table

There is a 1/101 chance of rolling the rare drop table. This will give the player two rolls on the rare drop table

Item	Quantity	Rarity	Price	High Alch
Nothing	N/A	2 × 1/556.67; Never^{[d 1]}	N/A	N/A
Coins	3,000	2 × 1/615.62	3,000	3,000
Uncut sapphire	1	2 × 1/2,585.6; 1/1,313^{[d 2]}	231	15
Loop half of key	1	2 × 1/641.39; 1/636.61^{[d 2]}	9,679	60
Tooth half of key	1	2 × 1/641.39; 1/636.61^{[d 2]}	9,771	60
Uncut emerald	1	2 × 1/5,171.2; 1/2,626^{[d 2]}	467	30
Uncut ruby	1	2 × 1/10,342.4; 1/5,252^{[d 2]}	1,104	60
Runite bar	1	2 × 1/2,585.6	12,263	3,000
Nature rune	67	2 × 1/4,309.33	11,524	7,236
Rune 2h sword	1	2 × 1/4,309.33	38,075	38,400
Rune battleaxe	1	2 × 1/4,309.33	24,449	24,960
Law rune	45	2 × 1/6,464	5,535	6,480
Death rune	45	2 × 1/6,464	8,460	4,860
Steel arrow	150	2 × 1/6,464	900	1,050
Rune arrow	42	2 × 1/6,464	1,974	10,080
Adamant javelin	20	2 × 1/6,464	760	1,920
Rune sq shield	1	2 × 1/6,464	22,553	23,040
Dragonstone	1	2 × 1/6,464	10,748	6,000
Silver ore	100 (noted)	2 × 1/6,464	6,100	4,500
Nature talisman	1	2 × 1/27,579.73; 1/14,005.33^{[d 2]}	280	2
Uncut diamond	1	2 × 1/41,369.6; 1/21,008^{[d 2]}	2,441	120
Rune kiteshield	1	2 × 1/12,928	31,964	32,640
Dragon med helm	1	2 × 1/12,928	58,453	60,000
Rune spear	1	2 × 1/13,647.7; 1/1,583.52^{[d 2]}^{[d 3]}	11,622	12,480
Rune javelin	5	2 × 1/82,739.2; 1/42,016^{[d 2]}	675	1,200
Shield left half	1	2 × 1/27,295.41; 1/3,167.04^{[d 2]}^{[d 3]}	65,036	66,000
Dragon spear	1	2 × 1/36,393.87; 1/4,222.71^{[d 2]}^{[d 3]}	38,083	37,440

^ The "nothing" drop is removed while wearing a ring of wealth.
^ ^2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 The drop rate is increased while wearing a ring of wealth due to the "nothing" drop being removed.
^ ^3.0 ^3.1 ^3.2 Slightly reduced chance of dropping if Legends' Quest has not been completed.

Tertiary

Item	Quantity	Rarity	Price	High Alch
Brimstone key	1	1/40^{[d 1]}	Not sold	N/A
Clue scroll (hard)	1	1/100^{[d 2]}^{[d 3]}^[4]	Not sold	12
Alchemical hydra heads	1	1/256^[4]	Not sold	30,000
Clue scroll (elite)	1	1/256^{[d 4]}^{[d 3]}^[4]	Not sold	12
Jar of chemicals	1	1/2,000^[4]	63,661	0
Ikkle hydra	1	1/3,000^[4]	Not sold	N/A

^ Brimstone keys are only dropped if killed on a Slayer task given by Konar quo Maten.
^ The hard clue scroll drop rate increases to 1/95 after unlocking the hard Combat Achievements rewards tier.
^ ^3.0 ^3.1 Clue scrolls will drop as scroll boxes after the completion of X Marks the Spot.
^ The elite clue scroll drop rate increases to 1/243 after unlocking the elite Combat Achievements rewards tier.

Combat Achievements

There are 12 Combat Achievement tasks (totalling 61 points) available for Alchemical Hydra.

Name	Description	Type	Tier	Comp%
Alchemical Veteran	Kill the Alchemical Hydra 75 times.	Kill Count	Elite (4 pts)	15.9%
Alcleanical Hydra	Kill the Alchemical Hydra without taking any damage.	Perfection	Master (5 pts)	14.8%
Lightning Lure	Kill the Alchemical Hydra without being hit by the lightning attack.	Mechanical	Master (5 pts)	15.6%
Don't Flame Me	Kill the Alchemical Hydra without being hit by the flame wall attack.	Mechanical	Master (5 pts)	15.7%
Unrequired Antipoisons	Kill the Alchemical Hydra without being hit by the acid pool attack.	Mechanical	Master (5 pts)	15.4%
Mixing Correctly	Kill the Alchemical Hydra without empowering it.	Mechanical	Master (5 pts)	15%
Working Overtime	Kill the Alchemical Hydra 15 times without leaving the room.	Stamina	Master (5 pts)	10.6%
Alchemical Master	Kill the Alchemical Hydra 150 times.	Kill Count	Master (5 pts)	14.8%
The Flame Skipper	Kill the Alchemical Hydra without letting it spawn a flame wall attack.	Mechanical	Master (5 pts)	12.8%
Alchemical Speed-Chaser	Kill the Alchemical Hydra in less than 1 minute 45 seconds.	Speed	Master (5 pts)	9.4%
Alchemical Speed-Runner	Kill the Alchemical Hydra in less than 1 minute 20 seconds.	Speed	Grandmaster (6 pts)	3.6%
No Pressure	Kill the Alchemical Hydra using only Dharok's Greataxe as a weapon whilst having no more than 10 Hitpoints throughout the entire fight.	Restriction	Grandmaster (6 pts)	4.9%

Gallery

A concept of the Alchemical Hydra shown during RuneFest 2018.
A teaser image of the Alchemical Hydra in an area resembling Dragonkin architecture
The decapitation of one of the boss's heads, created by Mod Ghost
A piece of official artwork depicting the Alchemical Hydra.
The Alchemical Hydra Steam Trading Card.

Dialogue

This article on an NPC has an associated dialogue page.
Click here for a transcript of possible conversations with this NPC.

Changes

Date	Changes
25 June 2025 (Update)	Alchemical Hydra now has a 50% elemental weakness to earth spells.
9 March 2022 (Update)	Certain Combat Achievement tasks now perform their checks correctly in the final phase of the Alchemical Hydra fight.
26 August 2021 (Update)	Alchemical Hydra's animation issues have been fixed.
14 July 2021 (Update \| poll)	The Alchemical Hydra now has an animation to indicate it changing attack styles.
13 June 2019 (Update)	Players can no longer logout in the Alchemical Hydra room due to an issue where players trying to log out in the room kept getting stuck in a state where they couldn't attack the boss but it kept trying to attack them.
7 February 2019 (Update \| poll)	The alchemical hydra heads were added as a possible tertiary drop.
31 January 2019 (Update)	The jar of chemicals was added as a possible tertiary drop.
14 January 2019 (Update)	Hotfix The Alchemical Hydra gained access to Konar's drop table.^[5]

Trivia

Despite being visible in the overworld, the Alchemical Hydra is fought in an instance.
The Alchemical Hydra has the highest Slayer requirement of all the slayer bosses, overtaking the thermonuclear smoke devil.
The rocks right before the Hydras's chamber have examine texts that explains how Igneous Rocks are made.

References

^ Jagex. Mod Ash's Twitter account. 13 January 2019. Archived from the original on 16 April 2019. Mod Ash: "The first roll will go to the unique table OR to the standard table. The second roll will always go to the standard table. And you only get one pet roll in either situation."
^ Jagex. Mod Ash's Twitter account. 7 August 2023. Archived from the original on 10 August 2023. Mod Ash: "I believe those are 180 mins. This is not universal across all instances, but it's been enabled for quite a few repeatable boss rooms."
^ Whether a unique item is dropped is determined by the game rolling each item in succession, and if it fails, the next item is rolled. If any item is successfully rolled, it will be dropped, and if no item is rolled, it is replaced by a regular drop. The order is dragon thrownaxe, dragon knife, hydra's claw, hydra tail, hydra leather and brimstone ring piece. For example, a brimstone ring piece rate follows the formula
Jagex. Mod Munro's Twitter account. 14 February 2019. Archived from the original on 16 April 2019. Mod Munro: "Yes, your edit to the wiki is correct."
^ ^4.00 ^4.01 ^4.02 ^4.03 ^4.04 ^4.05 ^4.06 ^4.07 ^4.08 ^4.09 ^4.10 ^4.11 ^4.12 Jagex. Mod Munro's Twitter account. 13 February 2019. Archived from the original on 25 March 2019. Mod Munro: "As I mentioned on the Q & A, here are the pictures of the drop rates for various parts of Kebos. This time with the correct drop rate for the pieces of the Brimstone Ring."
^ Jagex. Old School RuneScape's Twitter account. 14 January 2019. Archived from the original on 25 May 2020. Old School RuneScape: "3. The Alchemical Hydra now accesses Konar's drop table."

v t e Alchemical Hydra
NPCs	Orrvor quo Maten Alchemical Hydra
Unique drops	Hydra's eye Hydra's fang Hydra's heart Hydra's claw Hydra tail Hydra leather Alchemical hydra heads Jar of chemicals Ikkle hydra
Equipment	Brimstone ring Dragon hunter lance Bonecrusher necklace Ferocious gloves
Other	Karuulm Slayer Dungeon Alchemical Attack!

Slayer monsters

Slayer Tower

Fremennik Slayer Dungeon

Lumbridge Swamp Caves

Karuulm Slayer Dungeon

Wyvern Cave

Catacombs of Kourend

God Wars Dungeon (Wilderness)

Neypotzli

Ruins of Tapoyauik

Others

	Desert Lizard Pyrelord Mogre Harpie Bug Swarm Killerwatt Vyre Sentinel Molanisk Terror dog Sea snake Young Hatchling Fever spider Brine rat Gryphon Boss Juvenile custodian stalker Warped Terrorbird Warped Tortoise Mutated Zygomite Ancient Cave horror Basilisk Knight Lava Strykewyrm Dust devil Mature custodian stalker Skeletal Wyvern Venator Aquanite Elder custodian stalker Cave kraken boss Dark beast Araxyte boss Cerberus Smoke devil boss
Superior monsters	Crushing hand Chasm Crawler Screaming banshee Twisted Giant rockslug Cockathrice Flaming pyrelord Infernal Monstrous basilisk Malevolent Mage Insatiable Bloodveld Mutated Dire Gryphon Vitreous Jelly Warped Chilled Spiked Turoth Mutated Terrorbird Mutated Tortoise Cave abomination Abhorrent spectre Repugnant Basilisk Sentinel Magma strykewyrm Shadow Wyrm Choke devil King kurask Blood-starved venator Marble gargoyle Ancient Custodian Elder Aquanite Nechryarch Guardian Drake Greater abyssal demon Night beast Nuclear smoke devil Dreadborn Araxyte Colossal Hydra

Bosses

World bosses

	The Hueycoatl Scurrius Giant Mole Deranged archaeologist Sarachnis Kalphite Queen Corporeal Beast Gemstone Crab
The Barrows Brothers	Ahrim the Blighted Karil the Tainted Dharok the Wretched Guthan the Infested Torag the Corrupted Verac the Defiled
The Dagannoth Kings	Dagannoth Prime Dagannoth Rex Dagannoth Supreme
God Wars Dungeon	Kree'arra Commander Zilyana General Graardor K'ril Tsutsaroth Nex
Moons of Peril	Eclipse Moon Blue Moon Blood Moon
The Wilderness bosses	Revenant maledictus Chaos Fanatic Crazy archaeologist Scorpia King Black Dragon Chaos Elemental Vet'ion (Calvar'ion) Venenatis (Spindel) Callisto (Artio)

Instanced bosses

	Amoxliatl Brutus (Demonic) Royal Titans (Branda the Fire Queen) (Eldric the Ice King) Zulrah Vorkath Phantom Muspah The Nightmare (Phosani's Nightmare) Yama Doom of Mokhaiotl Maggot King Mad Angel
Sporadic bosses	Obor Bryophyta The Mimic Hespori Skotizo
The Forgotten Four	The Leviathan The Whisperer Vardorvis Duke Sucellus

Slayer bosses

Minigame bosses

Skilling bosses

Raids

Chambers of Xeric	Tekton Vanguard Vespula Vasa Nistirio Muttadile Great Olm
Theatre of Blood	The Maiden of Sugadinti Pestilent Bloat Nylocas Vasilias Sotetseg Xarpus Verzik Vitur
Tombs of Amascut	Akkha Ba-Ba Kephri Zebak Tumeken's Warden Elidinis' Warden

Dragons and dragon-like races

	Lava Frost Reanimated Revenant Crystalline Corrupted Fairy Colossal Wyrm
Bosses	Elvarg Galvek Great Olm King Black Dragon Vorkath The Hueycoatl
NPCs	Alvarg Hekala K'klik Mr. Mordaut
Dragonkin	Dragonkin (A Tail of Two Cats) Dragonkin (Dragon Slayer II) Forcae Garak Karuulm Kerapac Orthacas Sakirth Sithaph Skeka Strisath Zorgoth

Merodach

Source site	Old School RuneScape Wiki
Canonical source	Alchemical Hydra
Content license	CC BY-NC-SA 3.0
License status	declared
Picture	Alchemical Hydra (serpentine) · file details