The Unfathomable

Gargantuan mythic celestial, lawful good

Armor Class 30 (natural armor)
Hit Points 6,457 (315d20 + 3150)
Speed 120 ft., climb 120 ft., fly 60 ft.

STR	DEX	CON	INT	WIS	CHA
40 (+15)	1 (-5)	31 (+10)	21 (+5)	28 (+9)	24 (+7)

Saving Throws Str +32, Dex +7, Con +22, Int +17, Wis +21, Cha +19
Skills Athletics +32, Perception +33, Religion +29
Damage Resistances bludgeoning, piercing, and slashing from non-Epic creatures
Damage Immunities radiant, righteous
Condition Immunities charmed, frightened, poisoned, prone
Senses blindsight 300 ft., passive Perception 43
Languages understands all but speaks only Celestial
Challenge Mythic 10

SPECIAL TRAITS

• Celestial Radiance. When the Unfathomable rolls initiative, it can choose to encase itself in a 500-foot-radius sphere of celestial energy. When a creature outside the area of this sphere starts its turn and is within 10 miles of the Unfathomable, it takes 90 (20d8) righteous damage. The sphere lasts for 1 hour or until the Unfathomable chooses to end the effect (no action required). Once the Unfathomable has used this trait, it cannot use it again until it finishes a long rest.
• Devastator. The Unfathomable can spend movement to deal damage to structures adjacent to its head. The Unfathomable deals 200 bludgeoning damage to an unattended object or structure within 5 feet of its head for every 10 feet spent in this manner. Additionally, the Unfathomable’s attacks are magical.
• Divine Resistance (5/Day). When the Unfathomable is affected by an attack, feature, or magical effect, it can choose to be immune that attack, feature, or magical effect for the effect’s duration (if any).
• Massive. The Unfathomable is over 500 feet long and 20 feet wide, typically occupying a 70-foot cube on the battlefield. Attacks and effects that cannot reach the Unfathomable’s head deal half damage to it. Additionally, it is immune to any effect that would force it to attempt an Intelligence, Wisdom, or Charisma saving throw if the Unfathomable’s head is out of range of the effect.
• Overrun. The Unfathomable ignores difficult terrain and damages anything in spaces through which it moves. When the Unfathomable moves into a space for the first time on its turn, it deals 35 (10d6) bludgeoning damage to all creatures and unattended objects and structures in that space.

ACTIONS

• Multiattack. The Unfathomable makes up to six Claw attacks, only two of which can be against the same target, or a Ram attack and two Claw attacks.
• Claw. Melee Weapon Attack: +32 to hit, reach 5 ft., one target. Hit: 34 (4d6 + 20) slashing damage, and the target is grappled (escape DC 40). If the Unfathomable drags a grappled creature along the ground, that creature is subjected to the Unfathomable’s Overrun feature.
• Power Word. The Unfathomable utters a power word, choosing one of the following options. Each creature within 500 feet of the Unfathomable is affected by the power word, which is considered a Deific effect.
• Power Word Fate. Affected creatures have their hit point maximums reduced to their current hit points for 1 minute.
• Power Word Purity. If an affected creature is under the effect of one or more Epic spells, one of the Epic spells end (creature’s choice). Otherwise, if any non-Epic spells affect the creature, those effects end.
• Power Word Smite. Creatures are vulnerable to damage dealt by the Unfathomable for 1 minute.
• Power Word Truth. Creatures cannot be hidden or invisible from the Unfathomable for 1 minute.
• Ram. Melee Weapon Attack: +32 to hit, reach 5 ft., one target. Hit: 130 (20d10 + 20) bludgeoning damage, and the target is thrown up to 120 feet away from the Unfathomable in a straight line in a direction of the Unfathomable’s choice.
• Teleport. The Unfathomable magically teleports to an unoccupied space on the same plane of existence. The Unfathomable cannot bring other creatures with it when it teleports in this manner.
• The Reckoning (1/Short or Long Rest). The Unfathomable unleashes a wall of apocalyptic energy in a 5-foot-radius, 1-mile-high wall centered on itself. At the end of each of its turns, the wall moves 1 mile away from the Unfathomable in all directions. This effect continues until the wall has traversed the entire plane. When the wall makes contact with another creature for the first time in a round, if that creature is a non-Epic creature, it is slain instantly and is reduced to dust. If the creature is an Epic creature, the Unfathomable learns its exact location and the creature cannot magically teleport for as long as the creature remains on the plane.

LEGENDARY ACTIONS

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

• Claw. The Unfathomable makes a Claw attack.
• Crawl. The Unfathomable moves up to half its speed.
• Power Word (Costs 3 Actions). The Unfathomable uses its Power Word action.
• Ram (Costs 2 Actions). The Unfathomable makes a Ram attack.
• Teleport (Costs 2 Actions). The Unfathomable uses its Teleport action.

MYTHIC ACTIONS

On initiative count 20 (losing initiative ties), the Unfathomable takes a mythic action to cause one of the following effects. The Unfathomable cannot cause the same effect twice in a row.

• Crushing Power. The radius of the sphere produced by the Unfathomable’s Celestial Radiance feature is reduced by 50 feet, and its damage is increased by 22 (5d8). This effect is cumulative, to a maximum of ten uses per instance of Celestial Radiance.
• Voice of Judgment. On the Unfathomable’s turns, it chooses a creature it can see and declares it to be cursed to die. The target creature suffers the following penalties until the Unfathomable is slain or until the Epic curse is removed. The creature cannot be immune to damage dealt by the Unfathomable. If the creature is slain by the Unfathomable, it cannot be returned to life by non-Deific means. The creature cannot be moved farther than 1 mile away from the Unfathomable. If a creature attempts to move farther than 1 mile away from the Unfathomable, it is instead magically teleported to an unoccupied space within 5 feet of the Unfathomable.