Unnamed Creature Yokubo? black whispers? Listhin?

Translucent shadowy body. All you can see are a glowy heart inside a dimly lit ribcage.

They live in isolation typically quite far from civilization. They will eat just about anything and are quite powerful magical beasts.

They do not have a face or 'regular' senses outside of hearing (possibly). They can however easily detect magic, and it is their favorite meal.

Quite a formidable opponent in any case.