Bloomstruck Moonlight

Broken Angel. The Bloomstruck Moonlight Angel is immune to any celestial or holy effects including damage.

Abyssal Light. The Bloomstruck Moonlight Angel turns any non-sentient plant within 25 ft of her into an abyssal plant, any plant creature killed by her turns into an abyssal version of that creature.

Chaos Vision. The Bloomstruck Moonlight Angel can see what if plants within her vision are corrupted or not without failure.

Chaos Life. when the Bloomstruck Moonlight Angel dies it disintegrates into dust.

Multi-Action. The Bloomstruck Moonlight Angel makes 2 attacks with its spear against different targets and either teleports or uses its shadow bolt.

Multi-Action. The Bloomstruck Moonlight Angel makes 2 attacks with its scythe and uses its scythe wave.

Spear Attack. Melee Weapon Attack: +16 to hit, reach 10 ft., 1 target. Hit: 35 (5d8 + 12) corrupt/magical piercing damage. 

Scythe Attack. Melee Weapon Attack: +14 to hit, reach 10 ft., up to 4 target within 10 ft of the angel and each other. Hit: 32 (4d8 + 14) corrupt/magical piercing damage. 

Shadow Bolt. Spell Attack: DC 18 dex save, range 30 ft beam. Hit: 33 (7d6 + 8) necrotic damage.

Scythe Wave. Ranged Spell Attack: +15 to hit, range 25 ft. hit: 33 (5d6 + 7) necrotic damage and 5 ft. knockback.

Teleport. The angel teleports up to 20 ft.

Reaction Name. When making an attack of opportunity it can chose to double the knockback from its scythe wave if it uses that as its opportunity attack.

Enter the description for how legendary actions work for your monster here.

Legendary Action Name (Costs # Actions). Enter the description for your legendary action.

as a mythical creature the abyssal angel can do one of these whenever it dies or fails a death save.

Chaos Aftermath. the abyssal angel deals 5d4+3 necrotic damage to all  non-abyssal creatures within 80 ft. of it and turning all non-sentient plants within that radius abyssal.

Last Breath (death only). the angel takes a last turn as if it was still alive and fully healed where it can make 2 actions, after this turn it dies and turns to dust.

Disruption. the angel chooses 1 creature within 20 ft. this creature gains disadvantage on its next d20, the creature does not know that this happens as they just feel a disruption in their body/spirit.

Terraforming Power. the terrain becomes 10 times as drastic multiplying any change in elevation by 10.

Split (death only). the angel turns into a giant sludge of ooze that splits and rebuilds into lesser bloom servants (ill make a stat block for those at some point).