Animus Demon

Sage Eyes. Ancient and experienced in the world of magic, the Animus Demon has advantage on saving throws against any spell it sees being cast.
Additionally, it may use an Action to cast Detect Magic, Identify or Fabricate

Spellcasting. The Animus Demon is a 9th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17, +9 to hit with spell attacks). The Animus Demon has following Wizard spells prepared:
Cantrips (at will): Mind Sliver, Mage Hand, Minor Illusion 
1st level (4 slots): Absorb Elements, Arms of Hadar, Disguise Self, Magic Missile 
2nd level (3 slots): Hold Person, Invisibility, Mirror Image, Misty Step, Mind Whip
3rd level (3 slots): Lightning Bolt, Bestow Curse
4th level (2 slots): Banishment, Black Tentacles, Dimension Door, Phantasmal Killer
5th level (1 slot): Synaptic Static

Siphon Mind. The Animus Demon delves into the mind of a creature it can see within 30ft, drawing magic and life itself from its target. A targeted creature must make a DC 17 Intelligence saving throw or take 6d10 psychic damage and become incapacitated until the end of its next turn. If a target succeeds its saving throw, it takes half damage and isn't incapacitated. The Animus Demon regains hit points equal to half the psychic damage dealt.

Grasping Hands. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 16 (2d10 + 4) bludgeoning damage. A creature hit by this attack is restrained, and has disadvantage on saving throws against the Mind Siphon feature.

Arcane Field. The Animus Demon controls the flow of magic around it, stealing energy from failed spells and using it to defend itself. When the Animus Demon succeeds a spell saving throw by 5 or more, an arcane shield is generated around it. This shield has a number of hit points equal to the spell's level x 10, and provides full cover from incoming attacks, while the Animus Demon is unaffected by it.
This shield lasts for one minute and functions as temporary hit points (i.e. it does not stack)

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