Du'ulora QuoriLarge aberration, lawful evilArmor Class 17 (natural armor)Hit Points 157 (15d10 + 75)

Du'ulora Quori
Large aberration, lawful evil
Armor Class 17 (natural armor)
Hit Points 157 (15d10 + 75)
Speed5 ft., fly 70 ft. (hover)
Str23,Dex13,Con20,Int15,Wis18,Cha19
Saving Throws Dex +5, Int +6, Wis +8
SkillsArcana +6, Deception +8, Perception +12
Damage Immunitiesfire
Damage Resistances psychic; bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities charmed, frightened
Sensesdarkvision 60 ft., passive Perception 22
Languages Common, Quori; telepathy 100 ft.
Challenge11 (7200 XP)
Empathic Aura. The quori has an intuitive awareness of the emotions and thoughts of creatures within 60 feet of it. It has advantage on Wisdom (Insight) checks made against those creatures. As a bonus action, the quori can choose to focus this empathy on a single creature within 60 feet of it. When it does, the quori can choose at the start of each of its turns to either grant itself advantage on attack rolls against that creature until the start of the quori’s next turn, or cause that creature to have disadvantage on attack rolls against the quori until the start of the quori’s next turn. This effect lasts for 1 minute, or until the quori uses a bonus action to switch targets.
Actions
Multiattack. The quori can use Burning Rage. It then makes three slam attacks.
Slam.Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 13 (2d6+6) bludgeoning damage and 3 (1d6) fire damage. If the target is a Large or smaller creature, it is grappled (escape DC 18).
Burning Rage. Each creature grappled by the quori must succeed on a DC 16 Wisdom saving throw or take 21 (6d6) fire damage. A creature that fails its save by 5 or more takes 35 (10d6) fire damage instead. If the quori kills a creature with this ability, the quori regains 10 hit points.

Also known as blackfuries, these quori are capable of driving beings’ innermost anger, exploiting it in battle, and even tapping into it such that the victim spontaneously combusts from sheer rage. It appears ghostly, yet is quite solid, grappling creatures with tentacles formed of shadow. 

Originally from Secrets of Sarlona.