Homebrew, Monster Manual (3e)
Springing Retreat. If the achaierai makes an attack & then moves out of reach of the targeted creature, the creature can't make an opportunity attack against the achaierai.
Multiattack. The achaierai makes two claw attacks & one bite attack. Bite. Melee Weapon Attack: +7 to hit, 5' reach, one target. Hit: 18 (4d6 + 4) 4d6+4 piercing damage. Claws. Melee Weapon Attack: +7 to hit, 10' reach, one target. Hit: 11 (2d6 + 4) 2d6+4 slashing damage, & the achaierai can attempt to grapple the targeted creature (escape DC 17). It can only grapple one creature at a time. Black Cloud (3/Day). The achaierai releases a toxic black cloud has a radius of 10'. Any creature within the radius of the cloud that is not an achaierai must make a DC 15 Constitution save or fall under an effect identical to the Confusion spell for up to 1 minute. The cloud harmlessly dissolves away on the achaierai's next turn.
Dodge. Trigger: The achaierai is targeted by an attack or ability that requires it to make a Dexterity saving throw. Response: The achaierai has advantage on the Dexterity saving throw. If the achaierai had disadvantage on the saving throw, the disadvantage is cancelled out.
Extraplanar (Acheron)