|Myxine glutinosa, from Les Poissons (1877) by Gervais and Boulart, via Wikimedia|
A hagfish swarm can pose a danger to adventurers in the water. They might be attracted by a recent kill that the party made, tearing into the flesh of the corpse and the heroes alike. Giant hagfish are even more dangerous, as they can tear open the hull of a ship to get at the food inside. Imagine the horror as the adventurers go belowdecks in a ship only to find it flooded with seawater, slime, and squirming eels feasting on livestock and sailors.
The following text in gold is available as Open Game Content under the OGL. Open Game Content is ©2017 Jonah Bomgaars.