Medium aberration, lawful evil

Armor Class: 18 (exo-skeleton)

Hit Points: 265

Speed: 30 ft

STR

18 +4

DEX

12 +1

CON

12 +1

INT

20 +5

WIS

17 +3

CHA

17 +3

Saving Throws: Int 1d20+10 , Wis 1d20+8 , Cha 1d20+8

Skills: Arcana 1d20+10 , Deception 1d20+8 , Insight 1d20+8 , Perception 1d20+8 , Persuasion 1d20+8 , Stealth 1d20+6

Senses: darkvision 120 ft.

Languages: Aklo, Deep speech, undercommon, telepathy 120 ft.

Challenge Rating: 13 (10,000 XP)

Actions

Multiattack. The mind flayer uses Mind Shackle and then makes two Tentacle attacks.   Tentacles. Melee Weapon Attack: 1d20+9 to hit, reach 5 ft., one target. Hit: 2d10+5 psychic damage. If the target is Medium or smaller, the mind flayer may grapple the target (escape DC 18) and must succeed on a DC 18 Intelligence saving trow or be stunned until this grapple ends.   Extract Brain. Melee Weapon Attack: 1d20+9 to hit, reach 5 ft., one incapacitated humanoid grappled by the mindflayer. Hit: 10d10+4 piercing damage. If this damage reduces the target to 0 HP, the mindflayer kills the target by extracting and devouring its brain.   Mind Shackle (Recharge 6). The mind flayer releases a scarab - a small scarab like construct - which seeks out a target to dominate. The target must make a DC 18 Wisdom saving throw or become charmed as the dominate monster spell. Each time a target saves against this ability, Mind Shackle recharges.   Mind Blast (Recharge 5-6). The mind flayer psionically emits psychic energy in a 60-foot cone. Each creature in that area must succeed on a DC 18 Intelligence saving throw or take 4d8+5 psychic damage and be stunned for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.  

Bonus Action

• Cantrips (at will): blade ward, dancing lights, mage hand, shocking grasp
• 1st level (4 slots): detect magic, disguise self, shield, sleep
• 2nd level (3 slots): blur, invisibility, ray of enfeeblement
• 3rd level (3 slots): clairvoyance, lightning bolt, sending
• 4th level (3 slots): confusion, hallucinatory terrain
• 5th level (2 slots): telekinesis, wall of force

Reactions

Psionic Counter. As a reaction to a creature manifesting a psionic power, the mind flayer can use his reaction to cancel the effect by spending a spell slot of equal level of the manifested power.