Aeorian Disruptor

Magic Resistance. This creature has advantage on saving throws against spells and other magical effects.

Magical Miasma. This creature is surrounded by a inky fog that supresses all light and sound. Everything within 5 feet of this creature is under the effect of the Darkness and Silence. When the Disruptor takes damage from any source, roll a DC 5 Constitution saving throw. On a failure, this effect is suppressed until the end of the Disruptor's next turn. The DC increases by 1 each time the Disruptor takes damage from another source, and resets after a failure.

Arcane Suppression. Spells of 1st level or higher that are cast within 60 feet of the disruptor must expend a spell slot of one level higher than the desired spell level effect.

Mage Slayer. When the Disruptor damages a creature that is concentrating on a spell, that creature has disadvantage on their concentration check to maintain the spell. 

Multiattack. The Disruptor makes one attacks with its tails, and one bite attack.

Tail Lash. Melee Weapon Attack: +6 to hit, reach 15 ft., 1 target. Hit: 7 (1d8 + 3) bludgeoning damage plus 3 (1d6) force damage. If the target is a Medium or smaller creature, it is grappled (escape DC 14) and pulled to an unoccupied space within 5 feet of the Disruptor. The Disruptor cannot use its tentacle lash on another target until this grapple ends. 

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 8(1d10 + 3) piercing damage plus 7 (2d6) force damage.

Disrupt (3/Day). A creature within 30 feet of the Disruptor must make a DC 14 Charisma saving throw or lose attunement to one random selected item.

Retreat. As a reaction when the Disruptor's Magical Miasma is suppressed, it may move up to 15 feet without provoking opportunity attacks.