Basilosaurus himself
Basilosaurus is of course a surviving member of the Basilosaurus species, he appears to be a simple animal acting on instinct than to protect the oceans, although it could be possible that he might be controlled by or his behavior influenced by Rahab. Basilosaurus seems to lack any special abilities, but being a prehistoric whale he does have some form of higher animal intelligence and echolocation. Basilosaurus must also go up for air being a whale, only able to hold his breath for 1 hour. Basilosaurus seems to pretty agile and flexible, capable of moving in ways that no other Basilosaurus specimen could. Basilosaurus mainly uses his teeth and jaws to attack, with his bite force being (possibly) 3,600 pounds. the Basilosaurus is overall a dangerous, strange, and mysterious character.