|Released||10 January 2019 (Update)|
|Always drops||Hydra bones|
|A ferocious Alchemical Hydra!|
|Max hit||17+17 (default)|
|Weakness||Stab, ranged, dragonbane weapons|
|Attack style||Ranged, magic|
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.
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]
Uniques[edit | edit source]
Due to a unique mechanic, items are very slightly rarer than officially announced and displayed here.
|Hydra's eye||1||1/180[d 1]||Not sold||60,000|
|Hydra's fang||1||1/180[d 1]||Not sold||60,000|
|Hydra's heart||1||1/180[d 1]||Not sold||60,000|
- The order players receive the items in are: Hydra's eye, Hydra's fang and finally Hydra's heart.
Armour and weaponry[edit | edit source]
|Mystic fire staff||1||8/101[d 1]||25,267||25,500|
|Mystic water staff||1||8/101[d 1]||25,179||25,500|
|Black d'hide body||1||5/101||7,461||8,088|
|Dragon med helm||1||3/101||59,195||60,000|
|Rune platebody||1||6/101[d 2]||38,620||39,000|
|Rune platelegs||1||3/101[d 2]||37,863||38,400|
|Rune plateskirt||1||3/101[d 2]||37,960||38,400|
|Mystic robe top (light)||1||1/101[d 3]||72,013||72,000|
|Mystic robe bottom (light)||1||1/101[d 3]||47,528||48,000|
Runes and ammunition[edit | edit source]
|Dragonstone bolts (e)||100–120||2/101||49,100-58,920||63,700-76,440|
|Onyx bolts (e)||35–50||1/101||304,010-434,300||315,000-450,000|
Noted herbs[edit | edit source]
There is a 10/101 chance to get noted herbs.
|Grimy avantoe||10–15 (noted)||1/64.6||17,680-26,520||100-150|
|Grimy kwuarm||25–30 (noted)||1/64.6||29,450-35,340||300-360|
|Grimy ranarr weed||10–15 (noted)||1/80.8||65,850-98,775||180-270|
|Grimy snapdragon||10–15 (noted)||1/80.8||77,030-115,545||120-180|
|Grimy cadantine||25–30 (noted)||1/80.8||34,825-41,790||325-390|
|Grimy dwarf weed||25–30 (noted)||1/80.8||12,925-15,510||350-420|
|Grimy lantadyme||25–30 (noted)||1/107.7||30,225-36,270||325-390|
|Grimy torstol||10–15 (noted)||1/107.7||71,870-107,805||150-225|
Seeds[edit | edit source]
There is a 2/101 chance of rolling the tree-herb seed drop table.
|Papaya tree seed||2–3||1/901.8||4,812-7,218||138-207|
|Palm tree seed||2–3||1/1,262.5||69,326-103,989||304-456|
|Spirit seed||2–3||1/1,578.1||Not sold||0|
|Dragonfruit tree seed||2–3||1/2,104.2||387,766-581,649||516-774|
|Redwood tree seed||2–3||1/3,156.2||62,620-93,930||780-1,170|
Other[edit | edit source]
|Ranging potion(3)||1||7/101[d 1]||842||172|
|Super restore(3)||2||7/101[d 1]||13,838||288|
|Dragon bones||30 (noted)||6/101||75,180||2,880|
Rare drop table[edit | edit source]
|Loop half of key||1||1/641.39; 1/636.61[d 1]||13,729||60|
|Tooth half of key||1||1/641.39; 1/636.61[d 1]||11,794||60|
|Uncut sapphire||1||1/2,585.6; 1/1,313[d 1]||647||15|
|Rune 2h sword||1||1/4,309.33||37,946||38,400|
|Uncut emerald||1||1/5,171.2; 1/2,626[d 1]||812||30|
|Rune sq shield||1||1/6,464||22,630||23,040|
|Silver ore||100 (noted)||1/6,464||7,600||4,500|
|Uncut ruby||1||1/10,342.4; 1/5,252[d 1]||1,494||60|
|Dragon med helm||1||1/12,928||59,195||60,000|
|Rune spear||1||1/13,647.7; 1/1,583.52[d 1][d 2]||12,068||12,480|
|Shield left half||1||1/27,295.41; 1/3,167.04[d 1][d 2]||65,573||66,000|
|Nature talisman||1||1/27,579.73; 1/14,005.33[d 1]||705||2|
|Dragon spear||1||1/36,393.87; 1/4,222.71[d 1][d 2]||37,968||37,440|
|Uncut diamond||1||1/41,369.6; 1/21,008[d 1]||3,033||120|
|Rune javelin||5||1/82,739.2; 1/42,016[d 1]||835||1,200|
Tertiary drops[edit | edit source]
|Brimstone key||1||1/50||Not sold||N/A|
|Alchemical hydra heads||1||1/256||Not sold||30,000|
|Clue scroll (hard)||1||1/100||Not sold||12|
|Clue scroll (elite)||1||1/256||Not sold||12|
|Jar of chemicals||1||1/2,000||134,319||0|
|Ikkle hydra||1||1/3,000||Not sold||N/A|
Gallery[edit | edit source]
A teaser image of the Alchemical Hydra in an area resembling Dragonkin architecture
Changes[edit | edit source]
|7 February 2019
|The alchemical hydra heads were added as a possible tertiary drop.|
|31 January 2019
|The jar of chemicals was added as a possible tertiary drop.|
|14 January 2019
|The Alchemical Hydra gained access to Konar's drop table.|
Trivia[edit | edit source]
- The Alchemical Hydra is the only boss capable of attacking players underneath it.
References[edit | edit source]
- 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."
- 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.)
- 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."
- Jagex. Old School RuneScape's Twitter account. 14 January 2019.
Dragons and dragon-like races