Ashwalker 2014
CR 1 undead
Medium undead, Neutral Evil
The ashwalker has immunity to a type of damage based on the type of dragon that killed it: acid (black, copper), cold (silver, white), fire (brass, gold, red), lightning (blue, bronze), or poison (green).
A creature that touches the ashwalker or hits it with a melee attack while within 5 feet of it takes 3 (1d6) damage of the type noted in its Breath Born trait.
The first time the ashwalker is reduced to 0 hp, it drops to 1 hp instead and its Draconic Breath automatically recharges. The ashwalker transforms into raw energy of the type noted in its Breath Born trait. While in this energy form, it is immune to all damage and to being grappled or restrained. At the end of the ashwalker’s next turn, it is destroyed.
The ashwalker doesn’t require air, food, drink, or sleep.
Actions
Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) bludgeoning damage plus 3 (1d6) damage of the type noted in the ashwalker's Breath Born trait.
The ashwalker exhales elemental energy in a 15-foot cone. Each creature in the area must make a DC 12 Constitution saving throw, taking 14 (4d6) damage of the type noted in its Breath Born trait on a failed save, or half as much damage on a successful one.
Source: Tome of Beasts 1 (2023 Edition) (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details