Somnacanth

A bellicose Leviathan that lives in the water and spreads soporific dust via its neck gills and tail to ensnare prey. When seen under the moonlight, it is said to resemble a maiden or mermaid.

Lulled to Sleep: A sleep-inducing substance contained in this monster's bivalve prey accumulates in the body and reacts with microbes to form a glowing powder visible in the countless gills of its mouth, neck, and tail.

Mermaid Hair: Although the appendage on this monster's head looks like little more than a purple fin, it is actually lined with countless spikes that can be released like arrows in a ranged attack.