Armor Class 14 (natural armor)
Hit Points 39 (6d8 + 12)
Speed fly 30 ft.
Skills Perception +6
Condition Immunities prone
Senses darkvision 120 ft., passive Perception 16
Languages Deep Speech, Undercommon, telepathy 120 ft.
Challenge 3
Bite. Melee Weapon Attack: +1 to hit, reach 5 ft., one target. Hit: 2 (1d6 - 1) piercing damage.
Eye Rays. The spectator shoots up to two of the following magical eye rays at one or two creatures it can see within 90 feet of it. It can use each ray only once on a turn.
Create Food and Water. The spectator magically creates enough food and water to sustain itself for 24 hours.
Spell Reflection. If the spectator makes a successful saving throw against a spell, or a spell attack misses it, the spectator can choose another creature (including the spellcaster) it can see within 30 feet of it. The spell targets the chosen creature instead of the spectator. If the spell forced a saving throw, the chosen creature makes its own save. If the spell was an attack, the attack roll is rerolled against the chosen creature.
Monster Manual (2014), p. 30