Beholder Zombie

If damage reduces the zombie to 0 Hit Points, it makes a Constitution saving throw (DC 5 plus the damage taken) unless the damage is Radiant or from a Critical Hit. On a successful save, the zombie drops to 1 Hit Points instead.

The zombie uses Eye Rays twice.

Melee Attack +5, reach 5 ft. 16 (4d6 + 2) Piercing damage.

The zombie randomly shoots one of the following magical rays at a target it can see within 120 feet of itself (roll 1d4; reroll if the zombie has already used that ray during this turn):
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1: Paralyzing Ray
CON Save DC 14.
Failure: The target has the Paralyzed condition and repeats the save at the end of each of its turns, ending the effect on itself on a success. After 1 minute, it succeeds automatically.
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2: Fear Ray
WIS Save DC 14.
Failure: 13 (3d8) Psychic damage, and the target has the Frightened condition until the end of its next turn.
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3: Enervation Ray
CON Save DC 14.
Failure: 10 (3d6) Necrotic damage, and the target has the Poisoned condition until the end of its next turn. While Poisoned, the target can't regain Hit Points.
Success: Half damage only.
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4: Disintegration Ray
DEX Save DC 14.
Failure: 27 (5d10) Force damage. If the target is a nonmagical object or a creation of magical force, a 10-foot Cube [Area Of Effect] of it disintegrates into dust.
Success: Half damage.
Success or Failure: If the target is a creature and this damage reduces it to 0 Hit Points, it disintegrates into dust.