Kraken

A kraken is a rare form of gargantuan squid. It is one of the most deadly monsters in existence. They have ten long tentacles, two of which are always used to maintain stability when attacking or defending, and long, protected heads with two eyes. Their beak-like mouths are located where the tentacles meet the lower portion of their bodies. They have been known to attack whole ships and drag them to the bottom of the ocean.

Note: Kraken originally appeared in this form in the 2nd Edition Monstrous Manual for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.