Hippos are a type of bulbous, aquamarine sea creature found within the depths of Oceanus.
Hippos fire a small projectile that tracks their target. Upon death, they will swell and explode after a small delay, damaging anything nearby.
Armored Hippos will fire their projectiles in sets of three.
Codex entry
'The majestic mares and stallions of the surface... you should see their underwater counterparts. Poseidon, predisposed to horses, must in some way be responsible.'