To tame a Tusoteuthis, gather a good amount of Black Pearls, its favorite taming food. Equip yourself with scuba gear and ride a strong water tame. Lure the Tusoteuthis to attack your tame, during which it will grapple it. Once it's holding onto your creature, feed it the Black Pearls directly from its beak. Maintain this process until the taming bar is full, ensuring your tame's health doesn't drop too low. Once tamed, the Tusoteuthis becomes a formidable underwater ally. Round all taming food amounts up to the next 50 stack, to be safe.

Passive: You need to tame it while the Tusoteuthis is awake.