Alchemical Hydra

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This article is about the boss variant of hydras. For the normal Slayer monster, see Hydra.

The Alchemical Hydra is a boss found in lower level of the Karuulm Slayer Dungeon in Mount Karuulm, requiring level 95 Slayer to kill. The Alchemical Hydra was the creation of an unnamed dragonkin. While the Dragonkin 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. In addition, as it is only 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.

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.

The boss's lair[edit | edit source]

To reach the boss, players must run north past the Tasakaal, then east past the hydras. They will then reach the entrance to the lair by Orrvor quo Maten. Alternatively, players with level 88 Agility can reach it safely by using the mysterious pipe just behind Kaal-Ket-Jor, though this takes roughly the same time as reaching it by running past the hydras.

The Alchemical Hydra's lair is located in an instanced area with no limits to how many players can fight it on a world, unlike the Grotesque Guardians which are limited to eight instances per world. If the player dies battling the Alchemical Hydra, they can pay a 100,000 coin fee to reclaim their items from Orrvor quo Maten. If the player dies elsewhere before reclaiming their items from there, their unclaimed items will be permanently lost. In addition to this, Orrvor's storage capabilities do not stack with others (e.g. Zulrah, Grotesque Guardians), so if players have items being held by one of these fights and dies to the Alchemical Hydra, the items there will be lost.

Fight overview[edit | edit source]

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 75%, 50% or 25% of its health, it will lose one of its heads and changes 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 can be avoided, but they can be devastating if dealt with carelessly.

When the Hydra is killed, it will respawn in approximately 25 seconds.

Drops[edit | edit source]

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 drop rate of 2/100 indicates that you have two 2/100 chances of receiving that item.[1]

Drops remain on the ground for 30 minutes, or until the player leaves the instanced area.

Drop rates estimated based on 292,738 kills from the Old School RuneScape Wiki drop log project, unless otherwise cited.

100%[edit | edit source]

Item Quantity Rarity Price High Alch
Hydra bones.png: Alchemical Hydra drops Hydra bones with rarity Always in quantity 2Hydra bones2Always13,064192

Uniques[edit | edit source]

Due to a unique mechanic, items are slightly rarer than officially announced and displayed here.[2]

Item Quantity Rarity Price High Alch
Hydra's eye.png: Alchemical Hydra drops Hydra's eye with rarity 1/181 in quantity 1Hydra's eye11/181[d 1][3]Not sold60,000
Hydra's fang.png: Alchemical Hydra drops Hydra's fang with rarity 1/181 in quantity 1Hydra's fang11/181[d 1][3]Not sold60,000
Hydra's heart.png: Alchemical Hydra drops Hydra's heart with rarity 1/181 in quantity 1Hydra's heart11/181[d 1][3]Not sold60,000
Hydra tail.png: Alchemical Hydra drops Hydra tail with rarity 1/513 in quantity 1Hydra tail11/513[3]77,85860,000
Hydra leather.png: Alchemical Hydra drops Hydra leather with rarity 1/514 in quantity 1Hydra leather11/514[3]8,686,64560,000
Hydra's claw.png: Alchemical Hydra drops Hydra's claw with rarity 1/1,001 in quantity 1Hydra's claw11/1,001[3]72,807,83590,000
Dragon thrownaxe.png: Alchemical Hydra drops Dragon thrownaxe with rarity 1/2,000 in quantity 500-1000Dragon thrownaxe500–1,0001/2,000[3]196,500-393,000225,000-450,000
Dragon knife.png: Alchemical Hydra drops Dragon knife with rarity 1/2,001 in quantity 500-1000Dragon knife500–1,0001/2,001[3]1,471,000-2,942,00050,000-100,000
  1. 1.0 1.1 1.2 The order players receive the items in are: Hydra's eye, Hydra's fang and finally Hydra's heart.

Weapons and armour[edit | edit source]

Item Quantity Rarity Price High Alch
Mystic fire staff.png: Alchemical Hydra drops Mystic fire staff with rarity 8/101 in quantity 1Mystic fire staff18/101[d 1]25,17925,500
Mystic water staff.png: Alchemical Hydra drops Mystic water staff with rarity 8/101 in quantity 1Mystic water staff18/101[d 1]25,08825,500
Battlestaff.png: Alchemical Hydra drops Battlestaff with rarity 5/101 in quantity 8-12 (noted)Battlestaff8–12 (noted)5/10164,056-96,08433,600-50,400
Black d'hide body.png: Alchemical Hydra drops Black d'hide body with rarity 5/101 in quantity 1Black d'hide body15/1017,3378,088
Dragon longsword.png: Alchemical Hydra drops Dragon longsword with rarity 3/101 in quantity 1Dragon longsword13/10159,20460,000
Dragon med helm.png: Alchemical Hydra drops Dragon med helm with rarity 3/101 in quantity 1Dragon med helm13/10159,03260,000
Rune platebody.png: Alchemical Hydra drops Rune platebody with rarity 6/101 in quantity 1Rune platebody16/101[d 2]38,45439,000
Dragon battleaxe.png: Alchemical Hydra drops Dragon battleaxe with rarity 2/101 in quantity 1Dragon battleaxe12/101119,303120,000
Rune platelegs.png: Alchemical Hydra drops Rune platelegs with rarity 3/101 in quantity 1Rune platelegs13/101[d 2]37,83738,400
Rune plateskirt.png: Alchemical Hydra drops Rune plateskirt with rarity 3/101 in quantity 1Rune plateskirt13/101[d 2]37,85538,400
Mystic robe top (light).png: Alchemical Hydra drops Mystic robe top (light) with rarity 1/101 in quantity 1Mystic robe top (light)11/101[d 3]71,44072,000
Mystic robe bottom (light).png: Alchemical Hydra drops Mystic robe bottom (light) with rarity 1/101 in quantity 1Mystic robe bottom (light)11/101[d 3]47,47748,000
  1. 1.0 1.1 Players will receive Mystic fire staff together with Mystic water staff
  2. 2.0 2.1 2.2 Players will receive Rune platebody together with Rune platelegs or Rune plateskirt
  3. 3.0 3.1 Players will receive Mystic robe top (light) together with Mystic robe bottom (light)

Runes and ammunition[edit | edit source]

Item Quantity Rarity Price High Alch
Chaos rune.png: Alchemical Hydra drops Chaos rune with rarity 6/101 in quantity 150-300Chaos rune150–3006/10112,300-24,6008,100-16,200
Death rune.png: Alchemical Hydra drops Death rune with rarity 6/101 in quantity 150-300Death rune150–3006/10131,200-62,40016,200-32,400
Blood rune.png: Alchemical Hydra drops Blood rune with rarity 6/101 in quantity 150-300Blood rune150–3006/10146,950-93,90036,000-72,000
Astral rune.png: Alchemical Hydra drops Astral rune with rarity 6/101 in quantity 150-300Astral rune150–3006/10124,750-49,5004,500-9,000
Dragonstone bolts (e).png: Alchemical Hydra drops Dragonstone bolts (e) with rarity 2/101 in quantity 100-120Dragonstone bolts (e)100–1202/10153,700-64,44063,700-76,440
Onyx bolts (e).png: Alchemical Hydra drops Onyx bolts (e) with rarity 1/101 in quantity 35-50Onyx bolts (e)35–501/101301,070-430,100315,000-450,000

Herbs[edit | edit source]

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

Item Quantity Rarity Price High Alch
Grimy avantoe.png: Alchemical Hydra drops Grimy avantoe with rarity 1/64.6 in quantity 10-15 (noted)Grimy avantoe10–15 (noted)1/64.620,970-31,455100-150
Grimy kwuarm.png: Alchemical Hydra drops Grimy kwuarm with rarity 1/64.6 in quantity 25-30 (noted)Grimy kwuarm25–30 (noted)1/64.631,650-37,980300-360
Grimy ranarr weed.png: Alchemical Hydra drops Grimy ranarr weed with rarity 1/80.8 in quantity 10-15 (noted)Grimy ranarr weed10–15 (noted)1/80.880,440-120,660180-270
Grimy snapdragon.png: Alchemical Hydra drops Grimy snapdragon with rarity 1/80.8 in quantity 10-15 (noted)Grimy snapdragon10–15 (noted)1/80.898,740-148,110120-180
Grimy cadantine.png: Alchemical Hydra drops Grimy cadantine with rarity 1/80.8 in quantity 25-30 (noted)Grimy cadantine25–30 (noted)1/80.839,575-47,490325-390
Grimy dwarf weed.png: Alchemical Hydra drops Grimy dwarf weed with rarity 1/80.8 in quantity 25-30 (noted)Grimy dwarf weed25–30 (noted)1/80.815,425-18,510350-420
Grimy lantadyme.png: Alchemical Hydra drops Grimy lantadyme with rarity 1/107.7 in quantity 25-30 (noted)Grimy lantadyme25–30 (noted)1/107.736,400-43,680325-390
Grimy torstol.png: Alchemical Hydra drops Grimy torstol with rarity 1/107.7 in quantity 10-15 (noted)Grimy torstol10–15 (noted)1/107.774,530-111,795150-225

Seeds[edit | edit source]

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

Item Quantity Rarity Price High Alch
Ranarr seed.png: Alchemical Hydra drops Ranarr seed with rarity 1/420.8 in quantity 2-3Ranarr seed2–31/420.8103,162-154,74360-90
Snapdragon seed.png: Alchemical Hydra drops Snapdragon seed with rarity 1/450.9 in quantity 2-3Snapdragon seed2–31/450.9137,376-206,06472-108
Torstol seed.png: Alchemical Hydra drops Torstol seed with rarity 1/573.9 in quantity 2-3Torstol seed2–31/573.9106,944-160,41684-126
Watermelon seed.png: Alchemical Hydra drops Watermelon seed with rarity 1/631.2 in quantity 30-45Watermelon seed30–451/631.22,430-3,645990-1,485
Willow seed.png: Alchemical Hydra drops Willow seed with rarity 1/631.2 in quantity 2-3Willow seed2–31/631.26,952-10,42818-27
Mahogany seed.png: Alchemical Hydra drops Mahogany seed with rarity 1/701.4 in quantity 2-3Mahogany seed2–31/701.47,254-10,88156-84
Maple seed.png: Alchemical Hydra drops Maple seed with rarity 1/701.4 in quantity 2-3Maple seed2–31/701.477,452-116,17856-84
Teak seed.png: Alchemical Hydra drops Teak seed with rarity 1/701.4 in quantity 2-3Teak seed2–31/701.4160-24056-84
Yew seed.png: Alchemical Hydra drops Yew seed with rarity 1/701.4 in quantity 2-3Yew seed2–31/701.4172,864-259,296170-255
Papaya tree seed.png: Alchemical Hydra drops Papaya tree seed with rarity 1/901.8 in quantity 2-3Papaya tree seed2–31/901.813,378-20,067138-207
Magic seed.png: Alchemical Hydra drops Magic seed with rarity 1/1,052.1 in quantity 2-3Magic seed2–31/1,052.1291,818-437,727506-759
Palm tree seed.png: Alchemical Hydra drops Palm tree seed with rarity 1/1,262.5 in quantity 2-3Palm tree seed2–31/1,262.5111,908-167,862304-456
Spirit seed.png: Alchemical Hydra drops Spirit seed with rarity 1/1,578.1 in quantity 2-3Spirit seed2–31/1,578.1Not sold0
Dragonfruit tree seed.png: Alchemical Hydra drops Dragonfruit tree seed with rarity 1/2,104.2 in quantity 2-3Dragonfruit tree seed2–31/2,104.2345,100-517,650516-774
Celastrus seed.png: Alchemical Hydra drops Celastrus seed with rarity 1/3,156.2 in quantity 2-3Celastrus seed2–31/3,156.2182,608-273,912648-972
Redwood tree seed.png: Alchemical Hydra drops Redwood tree seed with rarity 1/3,156.2 in quantity 2-3Redwood tree seed2–31/3,156.250,976-76,464780-1,170

Other[edit | edit source]

Item Quantity Rarity Price High Alch
Coins_10000.png: Alchemical Hydra drops Coins with rarity 0.5/101 in quantity 5550-25550Coins5,550–25,5500.5/1015,550-25,5505,550-25,550
Coins_10000.png: Alchemical Hydra drops Coins with rarity 9.5/101 in quantity 40000-60000Coins40,000–60,0009.5/10140,000-60,00040,000-60,000
Shark.png: Alchemical Hydra drops Shark with rarity 7/101 in quantity 2-4Shark2–47/1011,512-3,024204-408
Ranging potion(3).png: Alchemical Hydra drops Ranging potion(3) with rarity 7/101 in quantity 1Ranging potion(3)17/101[d 1]542172
Super restore(3).png: Alchemical Hydra drops Super restore(3) with rarity 7/101 in quantity 2Super restore(3)27/101[d 1]17,224288
Dragon bones.png: Alchemical Hydra drops Dragon bones with rarity 6/101 in quantity 30 (noted)Dragon bones30 (noted)6/10167,5302,880
Crystal key.png: Alchemical Hydra drops Crystal key with rarity 1/101 in quantity 1Crystal key11/10120,60690
  1. 1.0 1.1 Players will receive Ranging potion(3) together with two Super restore(3)

Rare drop table[edit | edit source]

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
Coins_1000.png: Alchemical Hydra drops Coins with rarity 1/615.62 in quantity 3000Coins3,0001/615.623,0003,000
Loop half of key.png: Alchemical Hydra drops Loop half of key with rarity 1/641.39 in quantity 1Loop half of key11/641.39; 1/636.61[d 1]10,08560
Tooth half of key.png: Alchemical Hydra drops Tooth half of key with rarity 1/641.39 in quantity 1Tooth half of key11/641.39; 1/636.61[d 1]9,42760
Uncut sapphire.png: Alchemical Hydra drops Uncut sapphire with rarity 1/2,585.6 in quantity 1Uncut sapphire11/2,585.6; 1/1,313[d 1]53015
Runite bar.png: Alchemical Hydra drops Runite bar with rarity 1/2,585.6 in quantity 1Runite bar11/2,585.612,3713,000
Nature rune.png: Alchemical Hydra drops Nature rune with rarity 1/4,309.33 in quantity 67Nature rune671/4,309.3316,0137,236
Rune 2h sword.png: Alchemical Hydra drops Rune 2h sword with rarity 1/4,309.33 in quantity 1Rune 2h sword11/4,309.3337,69338,400
Rune battleaxe.png: Alchemical Hydra drops Rune battleaxe with rarity 1/4,309.33 in quantity 1Rune battleaxe11/4,309.3324,47424,960
Uncut emerald.png: Alchemical Hydra drops Uncut emerald with rarity 1/5,171.2 in quantity 1Uncut emerald11/5,171.2; 1/2,626[d 1]71130
Law rune.png: Alchemical Hydra drops Law rune with rarity 1/6,464 in quantity 45Law rune451/6,4647,9656,480
Death rune.png: Alchemical Hydra drops Death rune with rarity 1/6,464 in quantity 45Death rune451/6,4649,3604,860
Steel arrow.png: Alchemical Hydra drops Steel arrow with rarity 1/6,464 in quantity 150Steel arrow1501/6,4644,9501,050
Rune arrow.png: Alchemical Hydra drops Rune arrow with rarity 1/6,464 in quantity 42Rune arrow421/6,4643,02410,080
Adamant javelin.png: Alchemical Hydra drops Adamant javelin with rarity 1/6,464 in quantity 20Adamant javelin201/6,4641,4601,920
Rune sq shield.png: Alchemical Hydra drops Rune sq shield with rarity 1/6,464 in quantity 1Rune sq shield11/6,46422,43123,040
Dragonstone.png: Alchemical Hydra drops Dragonstone with rarity 1/6,464 in quantity 1Dragonstone11/6,46411,7386,000
Silver ore.png: Alchemical Hydra drops Silver ore with rarity 1/6,464 in quantity 100 (noted)Silver ore100 (noted)1/6,4646,3004,500
Uncut ruby.png: Alchemical Hydra drops Uncut ruby with rarity 1/10,342.4 in quantity 1Uncut ruby11/10,342.4; 1/5,252[d 1]1,39560
Rune kiteshield.png: Alchemical Hydra drops Rune kiteshield with rarity 1/12,928 in quantity 1Rune kiteshield11/12,92832,04532,640
Dragon med helm.png: Alchemical Hydra drops Dragon med helm with rarity 1/12,928 in quantity 1Dragon med helm11/12,92859,03260,000
Rune spear.png: Alchemical Hydra drops Rune spear with rarity 1/13,647.7 in quantity 1Rune spear11/13,647.7; 1/1,583.52[d 1]11,83612,480
Shield left half.png: Alchemical Hydra drops Shield left half with rarity 1/27,295.41 in quantity 1Shield left half11/27,295.41; 1/3,167.04[d 1]65,49766,000
Nature talisman.png: Alchemical Hydra drops Nature talisman with rarity 1/27,579.73 in quantity 1Nature talisman11/27,579.73; 1/14,005.33[d 1]1,0082
Dragon spear.png: Alchemical Hydra drops Dragon spear with rarity 1/36,393.87 in quantity 1Dragon spear11/36,393.87; 1/4,222.71[d 1]37,98937,440
Uncut diamond.png: Alchemical Hydra drops Uncut diamond with rarity 1/41,369.6 in quantity 1Uncut diamond11/41,369.6; 1/21,008[d 1]2,950120
Rune javelin.png: Alchemical Hydra drops Rune javelin with rarity 1/82,739.2 in quantity 5Rune javelin51/82,739.2; 1/42,016[d 1]8701,200
  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 The drop rate of this item is increased when wearing a Ring of wealth.

Tertiary[edit | edit source]

Item Quantity Rarity Price High Alch
Brimstone key.png: Alchemical Hydra drops Brimstone key with rarity 1/50 in quantity 1Brimstone key11/50[d 1]Not soldN/A
Alchemical hydra heads.png: Alchemical Hydra drops Alchemical hydra heads with rarity 1/256 in quantity 1Alchemical hydra heads11/256[3]Not sold30,000
Clue scroll (hard).png: Alchemical Hydra drops Clue scroll (hard) with rarity 1/100 in quantity 1Clue scroll (hard)11/100[3]Not sold12
Clue scroll (elite).png: Alchemical Hydra drops Clue scroll (elite) with rarity 1/256 in quantity 1Clue scroll (elite)11/256[3]Not sold12
Jar of chemicals.png: Alchemical Hydra drops Jar of chemicals with rarity 1/2,000 in quantity 1Jar of chemicals11/2,000[3]95,5090
Ikkle hydra.png: Alchemical Hydra drops Ikkle hydra with rarity 1/3,000 in quantity 1Ikkle hydra11/3,000[3]Not soldN/A
  1. Brimstone keys are only dropped if killed on a slayer assignment given by Konar quo Maten.

Gallery[edit | edit source]

Changes[edit | edit source]

Date Changes
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)
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.[4]

Trivia[edit | edit source]

  • The Alchemical Hydra is the only boss capable of attacking players underneath it.

References[edit | edit source]

  1. Jagex. Mod Ash's Twitter account. 13 January 2019. (Archived from the original on 16 Apr 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."
  2. 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 1 / ((1999 / 2000) * (1999 / 2000) * (999 / 1000) * (511 / 512) * (511 / 512) * (1 / 180)) ≈ 1/181.07.
    Jagex. Mod Munro's Twitter account. 14 February 2019. (Archived from the original on 16 Apr 2019.)
  3. 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 Jagex. Mod Munro's Twitter account. 13 Feb 2019. (Archived from the original on 25 Mar 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."
  4. Jagex. Old School RuneScape's Twitter account. 14 January 2019.