Beholder

A large floating orb with a central eye, large mouth, and many smaller eyes sprouting from stalks atop its hideous form. Truly alien, beholder-kin come in many variations — all should be avoided.

Tales of the fearsome eye tyrants speak of lethal, spell-like abilities that can wreak havoc on an entire party at once!

— Volo

For once, Volo is not exaggerating. The beholder is a most challenging opponent.

— Elminster

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Source: bg2ee/original_manuals/baldurs_gate_2_ee_amn_survival_guide.pdf — "Some Monsters of the Sword Coast" → "Beholder".