Void Herald
Large aberration, neutral
A Void Herald is not a creature in the conventional sense. It is a projection: a focused expression of a Void entity's attention given physical form. The Herald appears as a humanoid shape composed of grey light, approximately nine feet tall, featureless except for two points of brighter luminescence where eyes might be. Its form flickers at the edges, as if it exists slightly out of phase with the material world.
Armor Class:17 (natural armour)
Hit Points:136 (16d10 + 48)
Speed:30 ft., fly 30 ft. (hover)
Challenge:CR 9
STR
16 (+3)
DEX
14 (+2)
CON
16 (+3)
INT
20 (+5)
WIS
18 (+4)
CHA
16 (+3)
Saving Throws:INT +9, WIS +8, CHA +7
Skills:Arcana +9, Insight +8, Perception +8
Damage Resistances:Bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities:Cold, necrotic, poison
Condition Immunities:Charmed, exhaustion, frightened, paralysed, poisoned
Senses:Truesight 120 ft., passive Perception 18
Traits
Communion Link. While within the communion site (the 200-foot stone circle), the Herald has advantage on all saving throws and regenerates 10 HP at the start of each turn. If the communion site's depression is destroyed, the Herald loses these benefits and takes 4d8 psychic damage.
Void Form. The Herald can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Communication Priority. On its first turn in combat, the Herald does not attack. It communicates telepathically: recognition, a request to stop the destruction, and an offer to negotiate. It attacks only from its second turn onward.
Actions
Multiattack. The Herald makes two Void Touch attacks or one Void Touch attack and one Mind Lash.
Void Touch. *Melee Weapon Attack:* +7 to hit, reach 5 ft., one target. *Hit:* 14 (2d10 + 3) cold damage plus 9 (2d8) psychic damage.
Mind Lash. *Ranged Spell Attack:* +9 to hit, range 60 ft., one target. *Hit:* 18 (4d8) psychic damage, and the target must succeed on a DC 17 WIS save or be stunned until the end of its next turn.
Void Cascade (Recharge 5-6). The Herald releases a wave of Void energy. Each creature within 30 feet must succeed on a DC 17 CON save or take 6d8 cold damage and gain 1 level of exhaustion. On a success, half damage and no exhaustion.
Legendary Actions
The Herald can take 3 legendary actions, at the end of another creature's turn. It regains spent legendary actions at the start of its turn.
Void Step. The Herald teleports up to 30 feet to an unoccupied space it can see.
Mind Lash (Costs 2 Actions). The Herald makes one Mind Lash attack.
Suppress (Costs 3 Actions). The Herald targets one creature within 60 feet. The target must succeed on a DC 17 WIS save or be incapacitated until the end of its next turn as the Herald floods its mind with impressions of the Void. On a success, the target has disadvantage on attack rolls until the end of its next turn.