Burkelle, Eye of Helix

Cunning Action. On each of its turns, Burkelle can use a bonus action to take the Dash, Disengage, or Hide action.

Sneak Attack (1/Turn). Burkelle deals an extra 7 (3d6) damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the spy that isn't incapacitated and the spy doesn't have disadvantage on the attack roll.

Aberent Mind: Magic cant read Burkelle's thoughts or put him to sleep 

Master of Tactics: Burkelle can use help as a bonus action and the range of this action is 30 feet rather than 5. 

Aberrant Deceiver: when reduced to 0 hp Burkelle, Eye of Helix drops his humanoid disguise and reverts to his true form as Burkelle Abberent Deceiver

 Spellcasting (Psionics). 

Burkelle casts one of the following spells, requiring no spell components and using Intelligence as the spellcasting ability (spell save DC 15):

• At-Will: Mind Sliver, Catapult
• 2/day each: Mage Armour, Charm Person, Arms of Hadar, Dissonant Whispers, hold person,  Mind Spike
• 1/day each: Dimension Door, Suggestion, Psychic Blast, Mind Fog

Multiattack. Burkelle makes two melee attacks.

Mindpoison Blade. melee weapon attack:  on hit 1d6 +3 piercing damage (+1d8 Psychic damage). on hit the target must make an INT save or be poisoned. when poisoned in this way the afflicted creature suffers 5 psychic damage per turn. at the end of each of its turns the afflicted creature can repeat the save.  Burkelle has advantage on any creature afflicted this way

Psychic Crush: Burkelle targets one creature it can see within 120 feet of itself. The target must make a DC 15 Wisdom saving throw, taking 12 (3d8 + 5) psychic damage on a failed save, or half as much damage on a successful one.

Uncanny dodge: Burkelle can use his reaction to half the damage of any to hit attack he can see

mind sliver (1 action) 

Attack (1 actions)

2/day spell (2 actions)