The Kraken is a boss unit added in the 4.8 Patch. This boss first appears in the mission Oh Kraken, My Kraken. After that, it respawns in the Western Ocean every 3 to 8 days for players level 40 and up.
The Kraken encounters consist of one body and 5 enemy Kraken Tentacles. The tentacles respawn when killed, so don't waste time attacking them. The body stats increase at level 60, but the tentacles do not.
All Kraken encounters have a 5% chance to drop the Kraken Tentacle.