Beholder

Dungeons and dragons eternal classic:
A beholder is an aberration comprising a floatingbody with a large fanged mouth and single eye on the front and many flexible eyestalks on the top. It is protected by chitinous plates.
Beholders are extremely xenophobic. They will sometimes take members of other, non-beholder races as slaves; however, they will engage in a violent intra-species war with others of their kind who differ even slightly in appearance. This intense hatred of other beholders is not universal; the most prominent exceptions are Hive Mothers, who use their powers of mind control to form hives with other beholders and beholder-kin. Beholder communities in the Underdark often, when provoked, wage war on any and all nearby settlements, finding the most resistance from the drow and illithids
Beholders worship their insane, controlling goddess known as the Great Mother, though some also, or instead, follow her rebel offspring, Gzemnid, the beholder god of gases.