Kraken - OSRS Wiki

The Kraken is a stronger and larger version of the cave kraken. It requires level 87 Slayer to kill and cannot be boosted. Located at the Kraken Cove, it can only be attacked if the player has cave krakens as a Slayer task, which also requires level 50 Magic. Alongside its non-boss variants, it is the only monster that drops the trident of the seas and Kraken tentacle.

Kraken Cove - OSRS Wiki

Trailblazer PSA: the wiki shows region requirements for items/quests/monsters, and you can customize it to the regions you've unlocked : r/2007scape

Kraken Cove, Old School RuneScape Wiki

Crevice (Kraken Cove) - OSRS Wiki

Zulrah - OSRS Wiki

Abyssal whip - OSRS Wiki

Stronghold Slayer Cave - OSRS Wiki

Update:Release the Kraken!, Old School RuneScape Wiki

Zeah RSPS - Wiki