Medium celestial, neutral

Imperfection Nullification. When a creature casts a spell Herald of Perfection can reduce the HP of another willing celestial it can see to 0 to cast counterspell as a 4th-level spell. The Herald's spellcasting ability modifier is +7. If counterspell is successful, the creature takes 21 (6d6) radiant damage.

Legendary Actions

The Herald can take 2 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 Herald regains spent legendary actions at the start of its turn.

Always Ready. The Herald gains 1 extra Reaction until the start of its next turn.

Culling the Weak. The Herald can reduce the hit points of a willingly celestial the Herald of Ultimateness can see to 0 to gain 2 extra reactions until the start of its next turn.