Cave kraken

Cave kraken are Slayer monsters that require 87 Slayer to kill. Located at the Stronghold Slayer Cave, they can only be attacked if you have them as a Slayer assignment. These monsters, along with their boss variant, are the only monsters to drop the Kraken tentacle and the Trident of the seas.

In order to attack a cave kraken, a player must disturb a whirlpool, causing the cave kraken to surface.

From any Slayer master:

This suggests that Ranged or Melee attacks are heavily reduced. Melee cannot be used as they move around on a lake and cannot be attacked on close range. This might also suggest that using a Dwarf multicannon will have their attacks reduced as it is a ranged-based attack.

As with all monsters in the Stronghold Slayer Cave, they can only be attacked if you have them as a Slayer assignment.

Weapons

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Armour

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Runes/Ammunition

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Seeds

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Herbs

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Other

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Trivia

 * Even though the Trident of the seas are uncommon, they can only be attacked while on a Slayer task, therefore their availability of their drops are still considered to be rare.
 * Cave Krakens are recoloured, resized Sea Troll Queens.
 * Cave Krakens and their boss variant are similar to RuneScape 3's Strykewyrms, which can only be attacked while on a Slayer task and must be disturbed to fight.