Disaster in the Underwake
“About 4 feet long from head to tentacle tip, grindylows appear to be half-goblin and half-octopus, the split occurring at the waist. Grindylows are violent, ravenous creatures that use their spears to hunt or just to poke at things that scream and cry.
Grindylows eat whatever they can kill, giving them a rather wide selection of meals. High or low, no one is safe from the brutish assaults; tribes of merfolk have been overwhelmed by bands of grindylows, as have galleons full of experienced sailors. While obvious predators such as giant eels or sharks evoke great fear from grindylows, no enemies are more hated than the squid, be it common or giant. None are sure where this disdain stems from, but it is speculated that a squid is to an octopus for a grindylow what a dog is to a goblin dog for goblins. Incredibly fond of their similarly designed kin, grindylows believe octopuses to be the epitome of beauty, with squids being regarded as hideous freaks in comparison. There is no greater insult to a grindylow than being called a squid."