Actions

Multiattack

The Gibberlord makes four melee attacks.

Maw of Madness

Melee Weapon Attack: +25 to hit, reach 30 ft., one target.
Hit: 110 (15d12 + 15) piercing damage, plus 55 (10d10) psychic damage. The target must succeed on a DC 28 Wisdom saving throw or be afflicted by short-term madness for 1 minute.

Crushing Tentacle

Melee Weapon Attack: +25 to hit, reach 100 ft., one target. Hit: 143 (22d12 + 15) bludgeoning damage. The target is grappled (escape DC 30). Until the grapple ends, the creature is restrained and takes 77 (14d10) acid damage at the start of each of its turns.

Corrupting Wail (Recharge 5-6)

The Gibberlord releases an unholy scream. Each creature within 300 feet must make a DC 28 Constitution saving throw, taking 36d10 necrotic damage and gaining a level of exhaustion on a failure, or half as much on a success.

Annihilation Maw (Recharge 6)

The Gibberlord opens a rift of gnashing, extradimensional mouths in a 60-foot radius centered on itself. Each creature in the area must make a DC 30 Dexterity saving throw or be drawn into the void, taking 50d10 force damage. A creature reduced to 0 hit points by this effect is consumed, erased from existence.

Legendary Actions

The Gibberlord can take 5 legendary actions, choosing from the options below. Only one legendary action can be used at a time, and only at the end of another creature’s turn. It regains spent legendary actions at the start of its turn.

Lash (Costs 1 Action)

The Gibberlord makes a Maw of Madness or Crushing Tentacle attack.

Warped Manifestation (Costs 2 Actions)

The Gibberlord spawns an aberrant horror within 60 feet. This creature is equivalent to a Gibbering Mouther or Aboleth (DM’s choice). It acts immediately after the Gibberlord and remains for 1 hour or until slain.

Break the Mind (Costs 3 Actions)

The Gibberlord targets a creature it can see within 300 feet. The target must make a DC 28 Intelligence saving throw or be reduced to 0 Intelligence and fall into a coma until they receive greater restoration or similar magic.

Reality Fracture (Costs 5 Actions)

The Gibberlord rips apart the fabric of space in a 500-foot radius, causing gravity shifts, time loops, and spatial warping. Until the end of its next turn, all creatures in the area suffer the effects of the reverse gravity and time stop spells (affecting only the Gibberlord).

Lair Actions

On initiative count 20 (losing initiative ties), the Gibberlord can use one of the following lair actions:

Howling Rift

A rift opens within 200 feet, pulling creatures toward it. Each creature in a 60-foot radius must make a DC 28 Strength saving throw or be dragged 30 feet toward the center, taking 66 (12d10) force damage.

Echo of the Void

Spectral mouths appear, whispering maddening truths. All creatures within 300 feet must make a DC 28 Intelligence saving throw or be stunned for 1 minute. They can repeat the save at the end of each turn.

Visions of Doom

The Gibberlord projects an apocalyptic nightmare into the minds of its foes. Each creature within 1 mile experiences intense hallucinations, imposing disadvantage on all attack rolls and saving throws for 1 minute.

Regional Effects

The Gibberlord’s presence distorts the world in the following ways:

• The sky within 50 miles churns with ever-shifting, impossible colors and writhing illusions.
• Gravity in the area fluctuates wildly, sometimes causing objects to float or crash violently to the ground.
• Water within 20 miles becomes a corrosive, acidic substance that melts flesh on contact.
• Structures and terrain seem to shift when unobserved, making navigation impossible without magical aid.
• Dreams within 100 miles become horrifying, prophetic visions of madness. Those who sleep must make a DC 25 Wisdom saving throw or suffer the effects of nightmare.

Suggested Environments

Large cave systems, where it will grow to fill its space.