Chralekai: The Old God of Darkness (Necromantic Dragon)

Legendary Resistance (3/Day). If the Necromantic Dragon fails a saving throw, it can choose to succeed instead.

Magic Resistance. The Necromantic Dragon has advantage on saving throws against spells and other magical effects.

Multiattack. The Necromantic Dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 7 (2d6) acid damage.

Claw. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) slashing damage.

Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage.

Frightful Presence. Each creature of the Necromantic Dragon's choice that is within 120 feet of the Necromantic Dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the Necromantic Dragon's Frightful Presence for the next 24 hours.

Death Breath (Recharge 5–6). The Necromantic Dragon exhale a breath of death in a 60-foot cone. Each creature in that area must make a DC 21 Dexterity saving throw, taking 63 (18d6) acid damage on a failed save, or half as much damage on a successful one.

The Necromantic Dragon can take 3 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 Necromantic Dragon regains spent legendary actions at the start of its turn.

Spawn Undead (Costs 3 Actions). The Necromantic Dragon vomits a swarm of zombies equal to 1d4 + 2 zombies. They spawn in front of him and begin their turns at the beginning of the next round.

Detect. The Necromantic Dragon makes a Wisdom (Perception) check.

Tail Attack. The Necromantic Dragon makes a tail attack.

Wing Attack (Costs 2 Actions). The Necromantic Dragon beats its tattered wings. Each creature within 10 feet of the Necromantic Dragon must succeed on a DC 22 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone. The Necromantic Dragon can then fly up to half its flying speed.