Formed by the Mists.

When created, the horror's body composition takes one of four forms: Aberrant Armor, Loathsome Limbs, Malleable Mass, or Oozing Organs. This form determines certain traits in this stat block.

Amorphous (Malleable Mass Only).

The horror can move through any opening at least 1 inch wide without squeezing.

Bile Body (Oozing Organs Only).

Any creature that touches the horror or hits it with a melee attack takes 5 (1d10) acid damage.

Relentless Stride (Loathsome Limbs Only).

The horror can move through the space of another creature. The first time on a turn that the horror enters a creature's space during this move, the creature must succeed on a DC 16 Strength saving throw or be knocked prone.

Actions

Multiattack.

The horror makes two Limbs attacks.

Limbs.

Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 21 (3d10 + 5) bludgeoning damage.

Hex Blast (Recharge 5–6).

The horror expels necrotic energy in a 30-foot cone. Each creature in that area must make a DC 15 Constitution saving throw, taking 45 (7d12) necrotic damage on a failed save, or half as much damage on a successful one.

Unspeakable Horror