Armor Class 15 (natural armor)
Hit Points 75 (10d10 + 20)
Speed fly 20 ft.
Saving Throws INT +5, WIS +5
Skills Perception +8
Condition Immunities prone
Senses darkvision 120 ft., passive Perception 18
Languages Deep Speech, Undercommon, telepathy 600 ft.
Challenge 5
Telepathic Hub. When the mindwitness receives a telepathic message, it can telepathically share that message with up to seven other creatures within 600 feet of it that it can see.
Multiattack. The mindwitness makes two attacks: one with its tentacles and one with its bite.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 16 (4d6 + 2) piercing damage.
Tentacles. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 20 (4d8 + 2) psychic damage. if the target is Large or smaller, it is grappled (escape DC 13) and must succeed on a DC 13 Intelligence saving throw or be stunned until this grapple ends.
Eye Rays. The mindwitness shoots three of the following magical eye rays at random (reroll duplicates), choosing one to three targets it can see within 120 feet of it:
Volo's Guide to Monsters, p. 176