Kraken monster of the depths

a new mob that spawns in oceans and will attack your boat. The Kraken looks like a giant zombie Nautilus just out of its shell. It would be found around ocean ruins and monuments. It would give exploring the ocean a bit more of a challenge. It would be a boss mob that can summon zombie Nautillus with drowns on top of them, kinda like how the wither summons wither skeletons. After you beat it, it would drop an item called crack tentacle, which could be used to draw hostile mobs closer to you to give you a bit more of a range in combat it can also be used on players