Gazer

Gazers (also known as eyeballs) were tiny (eight-inch wide), four-stalked, wild beholderkin. They often served as familiars for evil spellcasters.

A gazer was "born" out of a beholder's feverish dreams, in which its perception of scale and perspective was warped by its delirium. It then followed its creator like an aggressive pet, a fact that beholders considered amusing.

Abilities
The four eyestalks of gazers could cause effects similar to the spells cause fear, daze, mage hand, and ray of frost.

Uses
A gazer's eye could be transplanted into a humanoid by a beholder surgeon. The process killed the gazer, in a sense. This was done to turn said creature into an ocular adept, the only divine casters of the Great Mother who weren't beholders themselves. Vestiges of the gazer's psyche extended some influence on the receiver of this surgery.