Undead Whitescale

Regeneration. Undead Whitescale regains 10 hit points at the start of each of his turns. If he takes radiant damage, this trait doesn’t function at the start of his next turn. Undead Whitescale is destroyed only if he starts his turn with 0 hit points and doesn’t regenerate.

Undead Fortitude. If damage reduces the zombie to 0 Hit Points, it must make a Constitution saving throw with a DC of 5+the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Poison Flare. When Undead Whitescale is destroyed, a burst of poison gas is released and rises into the air. Any creature within 5 ft must make a DC 16 Constitution saving throw, taking 11 (2d10) poison damage on a failed save, or half as much on a successful one. The poison gas rises up into the air much like smoke from a fire.

Multiattack. Undead Whitescale attacks twice with his claws.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Cold Breath (Recharge 5-6). Undead Whitescale exhales its cold breath in a 15 ft cone. Each creature in the cone must make a DC 14 Constitution saving throw, taking 22 (4d10) cold damage on a failed save, or half as much damage on a successful one.