Ashen Abishai

Ash Glide. The Ashen Abishai can burrow through nonmagical unworked ash, and can fit within a 5ft 1 inch square of ash. While doing so, the Ashen Abishai doesn't disturb the material it moves through.

Ash Sense. While in contact with ash, the Ashen Abishai knows the exact location of any other creature in contact with the same ash.

Devil's Sight. Magical Darkness does impede the Ashen Abishai's darkvision.

Innate Spellcasting. The Ashen Abishai's innate spellcasting ability is Constitution (Spell save 14, +6 to hit with spell attacks). It can innately cast the following spells, requiring  no material components: At will: Distort Value.

Multiattack. The Ashen Abishai makes one Attack with it's Bite and one Attack with it's Claw.

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 23 (4d8 + 5) piercing damage. 

Claw. Melee Weapon Attack: +8 to hit, range 5 ft., one target. Hit: 20 (3d10 + 5) slashing damage.

Ash Breath (Recharge 5-6). The Ashen Abishai breathes ash in a 20 foot cone. Each creature in that area must make a DC 15 Constitution saving throw, or being Blinded and Stunned for a round on a failed save, or nothing on a successful one. Each turn an affected creature takes may take another save to remove the effect at the end of their turn.

Hide. As a Bonus Action the Ashen Abishai can spend 5 ft or more of movement to hide during combat. If ash is present along the ground by at least an inch it may hide within the ash.