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This article has a money making guide: Killing hydras.
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This article has a Slayer task guide here.
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Hydras are draconic creatures found in the lower level of the Karuulm Slayer Dungeon in Mount Karuulm, requiring level 95 Slayer to kill. They were created by a Dragonkin named Karuulm as a project which is not based on any prior work done by his fellow kin.
Hydras are only assigned as a Slayer task by Konar. There are two areas within the dungeon that contain hydras, one being exclusive to players on a hydra Slayer assignment. As both of these are located within the Karuulm Slayer Dungeon, 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, or else they will take rapid damage.
Killing a Hydra is a requirement for the elite Kourend & Kebos Diary. The Alchemical Hydra boss is task-only, but the standard Hydras found on the lower level of Mount Karuulm are not, so the achievement can be boosted using a Wild pie or other temporary skill boost.
The poison splats launched by the Hydra.
Hydras start off with a random combat style at the start of the battle, switching after three attacks, regardless if they hit or not. The magic attack appears as a trio of three dark green trails of spit shot from the left head, and arching to the player (not to be confused with the poison splats, which are light green orbs), while the ranged attack looks like a throwing knife being launched at the player from the right head, moving straight forward. During the fight, the middle head of the hydra will spit poison at three random tiles (one at the player's location, two elsewhere), dealing 4 poison damage every two ticks (or 1 to 2 damage if the player has poison immunity) when the player is standing on one. The initial splat has a 3x3 AoE.
Hydras can drop their eyes, fangs, and hearts, which are used to create the brimstone ring. Much like dark totem pieces, the body parts are dropped in order and additional body parts can be obtained once players have one of each part.
In addition, they can also drop their tail, which is combined with a dragonbone necklace and a bonecrusher to create the bonecrusher necklace.
Drop rates estimated based on 16,739 kills from the Drop Rate Project, unless otherwise cited.
The average Hydra kill is worth 12,543.13.
The average Hydra kill while on a Konar task is worth 14,278.46.
| Item |
Quantity |
Rarity |
Price |
High Alch |
 | Hydra bones | 1 | Always | 6,005 | 96 |
| Item |
Quantity |
Rarity |
Price |
High Alch |
 | Hydra's eye | 1 | 1/1,800.72; 1/360.72[d 1][d 2][1] | Not sold | 60,000 |
 | Hydra's heart | 1 | 1/1,800.72; 1/360.72[d 1][d 2][1] | Not sold | 60,000 |
 | Hydra's fang | 1 | 1/1,800.72; 1/360.72[d 1][d 2][1] | Not sold | 60,000 |
 | Hydra tail | 1 | 1/5,001; 1/1,001[d 1][1] | 64,003 | 60,000 |
 | Dragon thrownaxe | 200–400 | 1/10,000; 1/2,000[d 1][1] | 72,200–144,400 | 90,000–180,000 |
 | Dragon knife | 200–400 | 1/10,001; 1/2,001[d 1][1] | 525,400–1,050,800 | 20,000–40,000 |
- ^ 1.0 1.1 1.2 1.3 1.4 1.5 All pre-roll item drop rates increase while on a hydra Slayer task.
- ^ 2.0 2.1 2.2 The order players receive the items in are: Hydra's eye, Hydra's fang, and finally Hydra's heart.
| Item |
Quantity |
Rarity |
Price |
High Alch |
 | Black d'hide chaps | 1 | 3/128 | 4,681 | 3,732 |
 | Battlestaff | 2–3 (noted) | 2/128 | 15,348–23,022 | 8,400–12,600 |
 | Fire battlestaff | 1 | 5/128 | 8,918 | 9,300 |
 | Water battlestaff | 1 | 5/128 | 8,984 | 9,300 |
 | Rune kiteshield | 1 | 3/128 | 31,950 | 32,640 |
 | Rune platebody | 1 | 1/128 | 38,423 | 39,000 |
 | Mystic robe bottom | 1 | 1/128 | 47,948 | 48,000 |
 | Dragon longsword | 1 | 1/128 | 59,005 | 60,000 |
| Item |
Quantity |
Rarity |
Price |
High Alch |
 | Blood rune | 15–45 | 9/128 | 5,505–16,515 | 3,600–10,800 |
 | Chaos rune | 20–50 | 9/128 | 1,460–3,650 | 1,080–2,700 |
 | Death rune | 30–60 | 9/128 | 5,460–10,920 | 3,240–6,480 |
 | Fire rune | 70–90 | 9/128 | 420–540 | 140–180 |
 | Law rune | 30–60 | 9/128 | 4,260–8,520 | 4,320–8,640 |
 | Water rune | 70–90 | 9/128 | 350–450 | 140–180 |
There is a 4/128 chance of rolling the herb drop table. There is a 2/128 chance to hit the noted herb drop table.
| Item |
Quantity |
Rarity |
Price |
High Alch |
 | Grimy guam leaf | 1–3 | 1/128 | 69–207 | 7–21 |
 | Grimy marrentill | 1–3 | 1/170.7 | 22–66 | 8–24 |
 | Grimy tarromin | 1–3 | 1/227.6 | 109–327 | 9–27 |
 | Grimy harralander | 1–3 | 1/292.6 | 848–2,544 | 9–27 |
 | Grimy ranarr weed | 1–3 | 1/372.4 | 8,972–26,916 | 18–54 |
 | Grimy irit leaf | 1–3 | 1/512 | 696–2,088 | 10–30 |
 | Grimy avantoe | 1–3 | 1/682.7 | 1,715–5,145 | 10–30 |
 | Grimy kwuarm | 1–3 | 1/819.2 | 1,360–4,080 | 12–36 |
 | Grimy cadantine | 1–3 | 1/1,024 | 1,560–4,680 | 13–39 |
 | Grimy lantadyme | 1–3 | 1/1,365.3 | 1,374–4,122 | 13–39 |
 | Grimy dwarf weed | 1–3 | 1/1,365.3 | 976–2,928 | 14–42 |
| Grimy avantoe | 3 (noted) | 1/192 | 5,145 | 30 |
| Grimy ranarr weed | 3 (noted) | 1/240 | 26,916 | 54 |
 | Grimy snapdragon | 3 (noted) | 1/320 | 37,941 | 36 |
 | Grimy torstol | 3 (noted) | 1/320 | 23,445 | 45 |
There is a 4/128 chance of rolling the rare seed drop table.
There is a 2/128 chance of rolling the bolt tips drop table.
There is a 1/128 chance of rolling the gem drop table.
| Item |
Quantity |
Rarity |
Price |
High Alch |
 | Nothing | N/A | 1/256.47; Never[d 1] | N/A | N/A |
 | Uncut sapphire | 1 | 1/512; 1/260[d 2] | 349 | 15 |
 | Uncut emerald | 1 | 1/1,024; 1/520[d 2] | 540 | 30 |
 | Uncut ruby | 1 | 1/2,048; 1/1,040[d 2] | 1,154 | 60 |
 | Nature talisman | 1 | 1/5,461.33; 1/2,773.33[d 2] | 497 | 2 |
 | Uncut diamond | 1 | 1/8,192; 1/4,160[d 2] | 2,779 | 120 |
 | Loop half of key | 1 | 1/16,384; 1/8,320[d 2] | 10,150 | 60 |
 | Tooth half of key | 1 | 1/16,384; 1/8,320[d 2] | 9,977 | 60 |
 | Rune javelin | 5 | 1/16,384; 1/8,320[d 2] | 725 | 1,200 |
 | Rune spear | 1 | 1/262,144; 1/15,600[d 2][d 3] | 11,791 | 12,480 |
 | Shield left half | 1 | 1/524,288; 1/31,200[d 2][d 3] | 65,436 | 66,000 |
 | Dragon spear | 1 | 1/699,050.67; 1/41,600[d 2][d 3] | 37,171 | 37,440 |
| Date
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Changes
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7 February 2019
(update | poll)
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The damage from the Hydra's poison splat attacks are now halved should players have a form of immunity against poison.
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- ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 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."
Combat stats
