A Gloomfish is a Fallen in Oninaki.
Fallen that resemble simple marine life. Sometimes they'll hide and wait for a surprise attack; other times they'll charge right out of the blue. They tend to live on the water's edge, so take care when exploring shores or banks with lots of blind spots.
The Armorer's Toil 1-1
Shins are vulnerabilities. No amount of combat experience or training can strengthen them against attack. Of course, that is exactly where these crass Fallen love to strike. I used to flinch away from their slightest movement—that is, until today.