Sigil of Thalasa-Gorath

Thalasa-Gorath, The Cosmic Devourer

God Tier — Cosmic Entity

“Watch and tremble, for all shall be consumedand descend into oblivion.”

Origin

Thalasa-Gorath is the hunger at the edge of creation — a maw of tentacles, stars and teeth that drifts between worlds and feeds on light itself. Where it passes, suns go out and tides rise without a moon. It does not hate what it devours; it simply has never stopped being hungry.

Alignment
Unaligned (Beyond Good & Evil)
Type
Aberration / Cosmic / Fiend
Classification
Cosmic Entity
Challenge Rating
30+ (God Tier)
Threat Level
Apocalyptic

Cosmic Hunger

The closer Thalasa-Gorath drifts, the more the sky gives way to the cosmic void:

  • Stars dim and go dark, one by one
  • Regional tides rise with no moon to pull them
  • Time flows fluctuate and stutter
  • Purple void-flame eats through stone and steel
  • Madness and paralysis take the weak-willed
  • Gravity distorts — rubble, rivers and fog drift upward
These effects persist for days after Thalasa-Gorath moves on.

Nightmare Abilities

Celestial AnnihilatorAction

A beam of collapsing starlight tears a 300 ft. line through the battlefield. Creatures in the line make a DC 30 Dexterity save or take 12d12 force damage and are knocked prone; structures in the line are erased.

Devour SunAction

Thalasa-Gorath swallows the nearest light source. Daylight ends within 1 mile, radiant damage is halved, and every creature that can see it makes a DC 28 Wisdom save or is blinded for 1 round.

Eternal OblivionPassive

A creature reduced to 0 HP within 300 ft. is pulled into the maw and cannot be resurrected while Thalasa-Gorath lives.

Eternal DevastationPassive

Terrain within 1 mile is slowly consumed. Each hour the battlefield shrinks as edges crumble into the void.

Stardust VoidAction

A 60 ft. sphere of crushing stardust erupts. Creatures inside take 10d10 cold + 10d10 force damage and their flight and teleportation fail until the end of their next turn.

Cosmic SpellsLegendary Action

Casts any spell of 9th level or lower without components. Counterspell and dispel effects against it must exceed a DC of 30.

Phases of Thalasa-Gorath

I. The Convergence

HP: 100%–70%
Thalasa-Gorath in phase I, The Convergence

The hunger wakes. Tentacles anchor it to the world.

  • Gains access to all abilities.

II. Cosmic Revelation

HP: 69%–40%
Thalasa-Gorath in phase II, Cosmic Revelation

Its true shape unfolds into stars and teeth.

  • Gains extra Legendary Actions.
  • Gravity shifts every round.

III. The Void Ascendant

HP: 39%–10%
Thalasa-Gorath in phase III, The Void Ascendant

Rises into the sky. Only force and radiant can harm it.

  • Immunities expand.
  • Summons the Starving Hungers.

IV. The Inescapable Void

HP: 9%–1%
Thalasa-Gorath in phase IV, The Inescapable Void

The maw opens over everything. Distance and cover stop mattering.

  • Every action is a Legendary Action.
  • Fleeing creatures are pulled back.

V. The Eternal Eclipse

HP: 0% (Transcended)
Thalasa-Gorath in phase V, The Eternal Eclipse

Does not die. Its body becomes a dark star in the sky.

  • The region falls under permanent eclipse.

Lair Effects(When in Domain)

  • Sky is filled with drifting stars and open void.
  • The dead rise as stardust echoes.
  • Every minute, a random player is pulled toward the maw by a Gravity of Dread.
  • Light sources burn for half as long.
  • Turning or banishment effects fail.

Notable Minions

Maw of the MacrocosmMaw of the MacrocosmAbyssal LeviathansAbyssal LeviathansStarving HungersStarving Hungers

Potential Loot

The Stellar Heart
The Stellar Heart(Artifact)A dead star that still pulls on the light around it.
Void-Starved Fang
Void-Starved Fang(Legendary)Devours a spell cast at its wielder once per day.
Eclipse Mantle
Eclipse Mantle(Wondrous item)Wrap yourself in a pocket of starless night.
“You cannot hide from a hunger older than the stars.You can only be far enough away when it wakes.”