Special ability: Mind control
The quarem uses song to snare their prey and eat them. Nanghaithya is of the ascended class of the kind who has evolved the skill so that he can control others with normal spoken words. For that reason he had to wear a sealing cloth on his mouth, to prevent him from using his powers.
Quarem are, typically, immune to the mind control abilities of their fellow kind, and more perceptive of other methods of hypnotism.
I can't believe I forgot to post this here. Or, if I did, I tagged it incorrectly because I can't find it. Was going to make a full set of "encyclopaedia profiles" for 'em, but I got sidetracked while doing Zarich and never finished.
Because of Elini's summon animations, I always headcanon the daeva as being associated to a specific element. How it works has been evolving in my head over time, but currently they are "elemental guardians" who are each assigned to one element. They individually have other spell abilities based on whatever demon species they are.
Also, walking cactus, one of Nanghaithya's minions:
They're about as ridiculous and dumb as those yellow Minions.