Blackfrost

Frozen Carapace

Blackfrost’s body is encased in layered, semi-sentient ice. Whenever Blackfrost is hit by a melee attack, the attacker takes 5 (1d10) cold damage.

Warped Psyche (1/Day)

Blackfrost transcends conventional perception. For up to 3 rounds, it cannot be perceived, targeted, or detected unless a creature succeeds on a DC 19 Wisdom saving throw at the start of its turn.

A creature with a –3 or lower modifier to Perception automatically perceives Blackfrost during this effect.

This effect immediately ends if Blackfrost makes an attack.

Multiattack

Blackfrost reveals its countless claws and makes two Freeze Burn attacks.

Freeze Burn

Melee Weapon Attack: +16 to hit, reach 10 ft., one target.
Hit: 29 (4d12 + 10) slashing damage.

Slice Through

Blackfrost slashes a creature twice in rapid succession.

• First Slash: The wound is shallow but flash-freezes instantly, dealing 14 (4d6) cold damage.
• Second Slash: The follow-up strike cuts deep, mutilating the target, dealing 26 (8d4 + 7) slashing damage.

Thanks for the Wound (2/Day)

When Blackfrost is hit by a melee attack targeting its frozen armor, it can use its reaction to attempt to freeze the attacker.

The attacker must succeed on a Constitution saving throw against DC 19 (8 + Blackfrost’s proficiency bonus + its Constitution modifier) or become frozen, becoming incapacitated until the end of its next turn.

Hoarfrost (Costs 3 Actions)

Blackfrost rises on its twisted limbs and unleashes a roar like a million thunders combined.

The clouds above begin to freeze but do not fall. They churn and gather like scorched agate. Blackfrost roars again, and the sky obeys.

A bolt of lightning, colder than any ice and faster than sound, crashes down. A 70-foot-radius area is instantly obliterated as debris freezes midair.

Each creature in the area must make a DC 20 Dexterity saving throw, taking 66 (12d10) lightning and cold damage on a failed save, or half as much damage on a successful one.