Triskelegants
From The Fifth City Wiki
"The roiling beast seems determined to drive itself further into the deep. Your vessel bucks and heaves as the maelstrom peels the plates from your hull."[1]
Triskelegants are strange, triangular-shaped creatures that roam the depths of the Unterzee, notable for their ability to rotate extremely quickly,[2] generating maelstroms strong enough to damage the hulls of ships.[1] As their name might perhaps suggest, these creatures have three mouths, each one located on a "corner" of their bodies.[2]
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A Triskelegant.