Valkyra

Undeath minion. The dragon does not need to eat, breathe air or sleep.

Legendary Resistance (1/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Multiattack. The dragon can use its corpse breath. It then makes two attacks: either with its bite or with its claws.

Bite. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 9 (2d6 + 3) piercing damage;

Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (1d6 + 6) slashing damage.

Tail. Melee Weapon Attack: +7 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage.

Corpse breath (Recharge 5–6).

The dragon exhales necrotic gas in a 15-foot cone. Each creature in that area must make a DC 15 Dexterity saving throw, taking 16 (4d8) necrotic damage on a failed save, or half as much damage on a successful one.

The dragon can take 1 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.

Tail Attack. The dragon makes a tail attack.

Doot. The dragon makes a loud doot sound