Malleable Body. ash-fiends can go through certain obstacles without difficulties such as bars, grids, crevices and small openings. Hermetically sealed locations can negate this ability
Multiattack. the ash-fiend can make two slam attacks with his fists.
Slam. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 2) blundgeoning damage.
Ember Bolt. Ranged Weapon Attack: +7 to hit, range 30/90 ft., 1 target. Hit: 11 (2d6 + 4) fire damage.
Ember Breath (recharge: d6, 5-6). The ash-fiend exhales a cloud charged with hot ashes and embers in an 15 ft. cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 10 (3d6) fire damage on a failed save, or half as much damage on a successful one.
Ash Cloud. when being attacked the ash-fiend can cause their body to disfigure itself in a cloud of ashes and blackened smoke, negating any successful attack roll source damage. Ash-fiends can use this ability once per round.