Man O' War

The Man O' War is a Mythic Age Atlantean Naval myth unit that looks like a jellyfish capable of firing electric bolts.

Trivia 

The Man-of War is also the name of a species of real life jellyfish. It is one of the biggest Jellyfish, and it's tentacles reach down to great depths. It can't shoot bolts of lightning, though it is venomous.