Greater Star Spawn Emissary

Greater Star Spawn Emissary CR: 21

Huge aberration, neutral evil

Armor Class: 15 (natural armour)

Hit Points: 290 20d12+160

Speed: 40 ft , fly: 40 ft , can hover

STR

24 +7

DEX

13 +1

CON

26 +8

INT

27 +8

WIS

22 +6

CHA

25 +7

Saving Throws: Con +15, Int +15, Wis +15, Cha +14

Skills: Arcana +22, Perception +13

Damage Resistances: Acid, Force, Necrotic, Psychic

Condition Immunities: Charmed, Frightened

Senses: Truesight 120 ft, passive Perception 23

Languages: All, Telepathy 1,000 ft

Challenge Rating: 21

Legendary Resistance (4/Day). If the emissary fails a saving throw, it can choose to succeed instead.
Unusual Nature. The emissary doesn't require air, food, drink, and sleep.

Actions

Multiattack. The emissary makes three attacks.
Lashing Maw. Melee Weapon Attack +14 to hit, reach 15 ft, one target. Hit 20 2d12+7 piercing damage plus 13 3d8 acid damage.
Psychic Orb. Ranged Spell Attack +15 to hit, range 120 ft, one creature. Hit 27 3d12+8 psychic damage.
Unearthly Bile (Recharge 5-6). The emissary expels bile that splashes all creatures in a 30 foot radius sphere centred on a point within 120 feet of the emissary. Each creature in that area must make a DC 23 Dexterity saving throw, takin 55 10d10 acid damage on a failed save, or half as much damage on a successful one. For each creature that fails the saving throw, a gibbering mouther appears in an unoccupied space on a surface that can support it within 30 feet of that creature. The gibbering mouthers act right after the emissary on the same initiative count, gaining a +2 bonus to their attack and damage rolls, and fighting until they are destroyed. They disappear when the emissary dies.

Legendary Actions

The emissary can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of a creature's turn. The emissary regains spent legendary actions at the start of it's turn.

• Attack. The emissary teleports up to 30 feet to an unoccupied space it can see and makes one attack.
• Warp Space (Costs 2 Actions). The emissary causes the ground in a 20 foot that it can see in a 90 foot square to turn into teeth and maws until the start of it's next turn. The area becomes difficult terrain for the duration. Any creature takes 10 3d6 piercing damage for each 5 feet it moves on this terrain.
• Mind Cloud (Cost 3 Actions). The emissary unleashes a psychic wave. Each creature within 30 feet of the emissary must succeed on a DC 23 Wisdom saving throw or take 32 5d12 psychic damage. In addition, every spell ends on creatures and objects of the emissary's choice in that area.

A greater star spawn appears only when the lesser form of emissary is destroyed. It appears as a 25 ft monstrosity of ever changing flesh & other tissue, with no rhyme nor reason. Tendrils lash out, misshapen mouths gibber & bite, eyes poke out at odd angles, suckers appear in places, tongues extend or distend, internal organs are pulled and/or appear outside it's twisted body. In such cases, glimpses of it's previous forms can be made out, and noises & languages are spoken by the many mouths.

Suggested Environments

Any settlement or place saturated with magic.

Related Organizations

• The Church Under The Sea