Gargantuan Aberration, Chaotic Evil
Armor Class 21
Hit Points 349 (25d12 + 160)
Speed ft.
STR
22 (+6)
DEX
12 (+1)
CON
24 (+7)
INT
24 (+7)
WIS
18 (+4)
CHA
18 (+4)
Damage Resistances Fire, Force, Lightning, Poison, Radiant, Thunder
Damage Immunities Cold, Necrotic
Condition Immunities Charmed, Frightened, Grappled
Senses Darkvision, Passive Perception 28
Languages Abyssal, Celestial, Common
Challenge 20 (25,000 XP)
Proficiency Bonus +6
Traits

Legendary Resistance (3/Day). If Astel, Naturalborn of the Void fails a saving throw, it can choose to succeed instead.

Immutable Form. Astel, Naturalborn of the Void is immune to any spell or effect that would alter its form.

Fall of the Dark Star. Once bloodied (Half HP) Astel, Naturalborn of the Void begins to call upon the wrath of the cosmos. Ordering meteorites to fall to the earth. At the end of its turn and as a legendary action Astel may use 'Meteorite of Astel'.

Horror of the Cosmos. Each creature within 120 ft of Astel, Naturalborn of the Void must succeed on a DC 16 Wisdom saving throw or become Frightened for 30 seconds. A creature can repeat the saving throw at the end of each of its turns. On a success the effect ends and the creature is immune to Horror of the Cosmos for the duration of its life.

A frightened creature has disadvantage on saving throws against Cosmic Laser.

Wave of Darkness. At 75% HP Astel, Naturalborn of the Void unleashes rippling waves of Darkness for up to 30 ft radius around it. Creatures caught within must make a DC 21 Constitution Saving throw or take 38 (8d8+6) force damage and fall prone.
This effect repeats at 50% and 25%

Actions

Multiattack. Astel, Naturalborn of the Void makes three attacks with its Cadaverous Grasp or alternatively two with its Deadstar Tail and one Consume Entity.

Cadaverous Grasp. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 22 (4d6+6) slashing damage.

Consume Entity (Recharge 4-6). Astel, Naturalborn of the Void rushes forward 10 ft and seeks to grab one target creature, make a DC 20 Dexterity Saving throw. On a failure take 31 (5d10+6) piercing damage and be restrained. On a success take no damage.

A restrained creature must make the saving throw again at the start of their turn with the DC lowering by -2 each turn. For the duration of their restraint, each failure deals 5d10+6 with an additional 1d10 each turn.

Deadstar Tail. Melee Weapon Attack: +13 to hit, reach 80 ft., one target. Hit: 17 (2d8 +8) bludgeoning damage.

Meteorite of Astel. Ranged Spell Attack: +14 to hit, range 40/80 ft., one target. Hit: 31 (6d8+7) bludgeoning damage. The area of the Meteorite's fall burns an inky black void within a radius of 10 ft. Dealing 15 (2d8+7) cold damage to any creature that steps in or ends its turn within the void. The icy void remains until Astel is destroyed.

Reactions

Cosmic Laser (3 Charges) (Recharges 5-6). Once engaged if a creature attacking Astel, Naturalborn of the Void is more than 60 ft away. Then Astel may target them with a beam of pure cosmic energy. The beam is 180 ft in length and 15 ft wide. Creatures caught within the blast must make a DC 20 Dexterity Saving Throw or take 57 (10d10+7) force damage. Halved on a success.

Legendary Actions

Astel, Naturalborn of the Void 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. Astel, Naturalborn of the Void regains spent legendary actions at the start of its turn.

Attack. Astel, Naturalborn of the Void makes a Cadaverous Grasp attack.

Teleport. Astel, Naturalborn of the Void magically teleports up to 80 feet to an unoccupied space it can see.

Teleport Grab (2 actions). Astel, Naturalborn of the Void magically teleports up to 80 feet to an unoccupied space it can see. If a creature is within 10 ft of its new location it uses Consume Entity or Cosmic Laser if available.

Meteorite of Astel (Once Bloodied) (3 Actions). Ranged Spell Attack: +14 to hit, range 40/80 ft., one target. Hit: 31 (6d8+7) bludgeoning damage. The area of the Meteorite's fall burns an inky black void within a radius of 10 ft. Dealing 15 (2d8+7) cold damage to any creature that steps in or ends its turn within the void. The icy void remains until Astel is destroyed.

TheBylian

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