Comet Drone

Flyby. The comet drone doesn't provoke opportunity attacks when it flies out of an enemy's reach.

Freedom Upon Death. When the comet drone is reduced to zero hit points, all souls it has absorbed within the past day return to their corpses.

Innate Spellcasting. The comet drone's spellcasting ability is Constitution (spell save DC 21, +13 to hit with spell attacks). The comet drone has following spells prepared:

At will: levitate, plane shift

Multiattack. The comet drone makes two claw attacks and one beak attack.

Claws. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 26 (2d10 + 15) slashing damage. 

Beak. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 28 (2d12 + 15) slashing damage.

Frightful Presence. Each creature of the comet drone’s choice within 120 feet of it and aware of it must succeed on a DC 21 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, with disadvantage if the comet drone is within line of sight, 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 comet drone’s Frightful Presence for the next 24 hours.

Astral Breath. The comet drone fires an astral force from its maw in a 90-foot cone. Each creature within the cone must make a DC 21 Strength saving throw. Upon failure, the creature takes 63 (18d6) force damage and is knocked prone. Upon success, the creature takes half as much damage and suffers from no additional effects.

Soul Devour. The comet drone targets a creature that is on death saving throws, or is unconscious. The target creature's souls is then absorbed by the comet drone. The corpse of a soul absorbed creature lies empty and dea

The comet drone 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 comet drone regains spent legendary actions at the start of its turn.

Attack. The comet drone makes one claw attack or beak attack.

Move. The comet drone moves up to half its speed.

Astral Breath (Costs 2 Actions). The comet drone uses its astral breath action.