Huge fiend, chaotic evil
- Armor Class
- 19 (natural armor)
- Hit Points
- 150 (12d12 + 72)
- Speed
- fly 20 ft. (hover), 0 ft., canHover true ft.
- Challenge
- 18 (20,000 XP)
- Saving Throws
- Cha +13, Int +13
- Skills
- Arcana +13, History +13, Perception +13
- Damage Resistances
- cold; fire; lightning; bludgeoning, piercing, slashing from nonmagical attacks
- Damage Immunities
- poison
- Condition Immunities
- poisoned
- Senses
- truesight 120 ft., passive Perception 23
- Languages
- all, telepathy 120 ft.
Traits
The sibriex emits an aura of corruption 30 feet in every direction. Vegetation withers in the aura, and the ground in the aura is 3 for other creatures. Any creature that starts its turn in the aura must succeed on a DC 20 Constitution saving throw or take 14 (4d6) poison damage. A creature that succeeds on the save is immune to this sibriex's Contamination for 24 hours.
If the sibriex fails a saving throw, it can choose to succeed instead.
The sibriex has advantage on saving throws against spells and other magical effects.
Creatures that encounter a sibriex can be twisted beyond recognition. Whenever a creature fails a saving throw against the sibriex's Warp Creature effect, you can roll percentile dice and consult the Flesh Warping table to determine an additional effect, which vanishes when Warp Creature ends on the creature. If the creature transforms into a manes, the effect becomes a permanent feature of that body. A creature can willingly submit to flesh warping, an agonizing process that takes at least 1 hour while the creature stays within 30 feet of the sibriex. At the end of the process, roll once on the table (or choose one effect) to determine how the creature is transformed permanently.
Flesh Warping
| d100 | Effect |
|---|---|
| 01โ05 | The color of the target's hair, eyes, and skin becomes blue, red, yellow, or patterned. |
| 06โ10 | The target's eyes push out of its head at the end of stalks. |
| 11โ15 | The target's hands grow claws, which can be used as daggers. |
| 16โ20 | One of the target's legs grows longer than the other, reducing its walking speed by 10 feet. |
| 21โ25 | The target's eyes become beacons, filling a 15-foot cone with dim light when they are open. |
| 26โ30 | A pair of wings, either feathered or leathery, sprout from the target's back, granting it a flying speed of 30 feet. |
| 31โ35 | The target's ears tear free from its head and scurry away; the target is deafened. |
| 36โ40 | Two of the target's teeth turn into short tusks. |
| 41โ45 | The target's skin develops bark-like scales, granting it a +1 bonus to AC but reducing its Charisma score by 2 (to a minimum of 1). |
| 46โ50 | The target's arms and legs switch places, preventing the target from moving unless it crawls. |
| 51โ55 | The target's arms become tentacles with fingers on the ends, increasing its reach by 5 feet. |
| 56โ60 | The target's legs grow incredibly long and springy, increasing its walking speed by 10 feet. |
| 61โ65 | The target grows a long, thin tail, which it can use as a whip. |
| 66โ70 | The target's entire eyes turn black, and it gains darkvision out to a range of 120 feet. |
| 71โ75 | The target swells, tripling its weight. |
| 76โ80 | The target becomes thin and skeletal, halving its weight. |
| 81โ85 | The target's head triples in size. |
| 86โ90 | The target's ears become wings, giving it a flying speed of 5 feet. |
| 91โ95 | The target's body becomes unusually brittle, causing the target to have vulnerability to bludgeoning, piercing, and slashing damage. |
| 96โ00 | The target grows another head, causing it to have advantage on saving throws against being charmed, frightened, or stunned. |
Actions
The sibriex makes three Chain attacks, and it uses Squirt Bile.
Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 20 (2d12 + 7) force damage.
The sibriex targets one creature it can see within 120 feet of it. The target must succeed on a DC 20 Dexterity saving throw or take 31 (9d6) acid damage.
The sibriex targets up to three creatures it can see within 120 feet of it. Each target must make a DC 20 Constitution saving throw. On a successful save, a creature becomes immune to this sibriex's Warp Creature. On a failed save, the target is poisoned, which causes it to also gain 1 level of exhaustion. While poisoned in this way, the target must repeat the saving throw at the start of each of its turns. Three successful saves against the poison end it, and ending the poison removes any levels of exhaustion caused by it. Each failed save causes the target to gain another level of exhaustion. Once the target reaches 6 levels of exhaustion, it dies and instantly transforms into a living manes under the sibriex's control. The transformation of the body can be undone only by a wish spell.
Legendary Actions
The sibriex uses Spellcasting.
The sibriex uses Squirt Bile.
The sibriex uses Warp Creature.
Spellcasting
The sibriex casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 21):