Summary
A true Beholder.
A Spectator variant of Beholderkin
A Beholder is an aberration comprising a floating spheroid body with a large fanged mouth and single eye on the front and many flexible eyestalks on the top. True Beholders are terrifying opponents, with the ability of being able to instantly disintegrate a living being with their lethal eye rays.
A beholder's eyes each possess a different magical ability; the main eye projects an anti-magical cone, and the other eyes use different spell-like abilities (disintegrate objects, transmute flesh to stone, cause sleep, slow the motion of objects or beings, charm animals, charm humans, cause death, induce fear, levitate objects, and inflict serious wounds). Many variant beholder species exist, such as "observers", "spectators", "eyes of the deep", "elder orbs", "hive mothers", and "death tyrants". In addition, some rare beholders can use their eyes for non-standard spell-like abilities; these mutant beholders are often killed or exiled by their peers. Beholders wishing to cast spells like ordinary wizards relinquish the traditional use of their eyestalks, and put out their central anti-magic eye, making these beholder mages immediate outcasts.
Spectator
A spectator is an extraplanar beholderkin with four eyestalks. Somewhat mild and even-tempered, spectators have even been known to form friendships with other creatures, a trait that no other beholderkin or true beholder ever displays.