Gargantuan Monstrosity, Unaligned
Armor Class 21 (Natural Armor)
Hit Points 554 (27d20 + 270)
Speed 40 ft., Climb 20 ft.
STR
26 (+8)
DEX
15 (+2)
CON
30 (+10)
INT
5 (-3)
WIS
7 (-2)
CHA
10 (+0)
Saving Throws CON +19
Damage Resistances Force
Damage Immunities Poison; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Condition Immunities Charmed, Frightened, Poisoned
Senses Passive Perception 9
Languages --
Challenge 30 (155,000 XP)
Proficiency Bonus +9
Traits

Eater of Reality. The Weave Eater is unaffected by spells that focus around warping space-time, such as Time Stop, Slow or Reverse Gravity

Legendary Resistance (3/Day). If Weave Eater fails a saving throw, it can choose to succeed instead.

Actions

Multiattack. Weave Eater uses Entropic Fluid if it can. It then makes two attacks: One with its Headbutt and one with its Bite. It can use Swallow instead of Bite.

Headbutt. Melee Weapon Attack: +17 to hit, reach 10 ft., 1 target. Hit:  25 (3d10+8) Bludgeoning damage, and the target must succeed a DC 21 Constitution saving throw or be knocked Prone.

Bite. Melee Weapon Attack: +17 to hit, reach 10 ft., 1 target. Hit: 30 (4d10 + 8) Piercing damage plus 11 (3d6) Force damage. If the target is a creature, it is Grappled (Escape DC 18). Until this grapple ends, the target is Restrained, and Weave Eater cannot bite another target.

Swallow. The Weave Eater makes a Bite attack against a Large or smaller creature that it is grappling. If the attack hits, the creature takes the bite's damage. The creature is then swallowed, and the grapple ends. While swallowed, the creature is Blinded and Restrained, it has total cover against attacks and other effects outside of Weave Eater, and it takes 56 (16d6) force damage at the start of each of Weave Eater's turns. A creature reduced to 0 HP while inside of Weave Eater dies, and is destroyed entirely, along with any nonmagical objects in their possession.

If the Weave Eater takes 40 or more damage in a single turn from a creature inside of it, it must make a DC 25 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall Prone in a space within 10 feet of the Weave Eater. If the Weave Eater dies, the creature is no longer Restrained, and can escape from the corpse using 15 feet of movement, exiting prone.

Entropic Fluid (Recharge 5-6). The Weave Eater expels a burst of prismatic fluid in a 60 foot cone. Every creature within that area must make a DC 24 Constitution saving throw or take 44(8d10) Necrotic damage and gain Vulnerability to Weave Eater's Bite attack for 1 minute. The creature can repeat the save at the end of each of its turns, ending the effect on itself on a success. The effect can also be ended early by a Greater Restoration or similar effect. Surfaces and nonmagical objects touched by this bile soften, and become difficult terrain for any creature other than Weave Eater.

Legendary Actions

The Weave Eater 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. The Weave Eater regains spent legendary actions at the start of its turn.

Wormhole. The Weave Eater rips a hole into the Astral Plane, then climbs through it, reappearing somewhere else within 120 feet of where it vanished from.

Astral Sinkhole (Costs 2 Actions). The Weave Eater gnaws a fissure in the fabric of reality. Every creature except Weave Eater within 60 feet of the fissure when it appears must succeed a DC 21 Strength saving throw or be pulled up to 30 feet toward the fissure. Creatures pulled into the fissure are ejected into the Astral Plane. As an action on its turn, the creature can attempt a DC 21 Athletics check to climb back out of the fissure, reappearing in an unoccupied space within 10 feet of it. Creatures outside the fissure can attempt a DC 21 Athletics check to pull a trapped creature free.

Planar Eruption (Costs 3 Actions). The Weave Eater causes a fissure created by its Astral Sinkhole ability to violently implode. Any creatures it has trapped in the Astral Plane via that sinkhole are forced back into the plane they were pulled from and expelled up to 60 feet in a random direction, taking 28 (8d6) Force damage, as well as fall damage for the distance launched.

Description

An old tale, so far in the past as to be considered a folk legend, tells of a great insect that sought to consume the earth and sky. A silverfish the size of a castle, with jaws that tear fissures through existence itself. It is believed that this creature is the cause of the occasional intersection of the planes, as the long-enduring scars of the creature's unrelenting hunger linger as gashes and portals where one plane leaks into another. 

The Great Consumer.

The Weave Eater, seen in its tales as an engine of pure destruction, is little more intelligent than the pests with which it shares a likeness, wishing to feed purely to satiate itself and its seemingly endless hunger. And, as a normal silverfish gnaws through fabrics, so does the Weave Eater tear at the very fabric of reality. 

The creature's saliva softens and denatures anything it comes into contact with, weakening the fundamental structure of the affected region to such a degree that the beast's great jaws can, in turn, sink into and tear a hole in not only the object, but the very fundamental structure of it. In doing so, the Weave Eater consumes not only matter, but the very space which enters its maw. Its stomach is a strange void of blackness, in which both objects and fundamental concepts are rapidly eroded, leaving behind nothing but denatured cosmic energy which the Weave Eater subsists on.

Eternal Imprisonment.

Due to its apocalyptic nature, the Weave Eater was rightfully considered a danger to everything that exists. To prevent it from continuing its rampage, but fearing the creature impossible to slay with any number of men, the beast was instead subjected to an Imprisonment spell that sealed it deep below ground, in the very furthest reaches of the Underdark. In an attempt to ensure that freeing the Weave Eater would be impossible, it was decided that the condition necessary to free the creature would be to allow sunlight to shine upon its prison. A feat that, by all accounts, was projected to be inconceivable.

Monster Tags: monstrosity

Habitat: Underdark

Anoel

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