Ice Walk. The dragon can move across and climb icy surfaces without needing to make an ability check. Additionally, difficult terrain composed of ice or snow doesn't cost it extra movement.
Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.
Chromatic Awakening (Recharges after a Short or Long Rest). If Cryovain would be reduced to 0 hit points, its current hit point total instead resets to 400 hit points, it recharges its Breath Weapon, and it regains any expended uses of Legendary Resistance. Additionally, Cryovain can now use the options in the “Mythic Actions” section for 1 hour. Award a party an additional 41,000 XP (82,000 XP total) for defeating Cryovain after its Chromatic Awakening activates.
Ruthless Aggression. Cryovain ignores all resistances to any damage that she would deal.
Multiattack. Cryovain can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 4 (1d8) cold damage.
Claw. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.
Tail. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage.
Frightful Presence. Each creature of Cryovain 's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.
Cold Breath (Recharge 4–6). The dragon exhales an icy blast in a 60-foot cone. Each creature in that area must make a DC 21 Constitution saving throw, taking 64 (14d8) cold damage on a failed save, or half as much damage on a successful one. Additionally if you fail your save by 5 or more you gain 1 point of exhaustion.
Ice Stomp. (Recharge 6). As a bonus action Cryovain may stomp the icey surface in his lair causing all creatures within 60 feet of him to make a DC19 dexterity saving throw, taking 19 (9d4) cold damage on a failed save and are knocked prone, or half as much damage on a successful one but remain standing.
Tail Attack. If any creature comes within 15 feet of Cryovain's tail he may make one Tail attack.
Cryovain 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 dragon regains spent legendary actions at the start of its turn.
Detect. Cryovain makes a Wisdom (Perception) check.
Tail Attack. Cryovain makes a tail attack.
Wing Attack (Costs 2 Actions). Cryovain beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 19 Dexterity saving throw or take 13 (2d6 + 6) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.
If the Cryovain's Chromatic Awakening trait has activated in the last hour, it can use the options below as legendary actions.
Bite. Cryovain makes one Bite attack.
Lesser Breath Weapon (Costs 2 Actions). Cryovain makes a breath weapon attack that is not fully recharged. It has the following properties: The dragon exhales an icy blast in a 30-foot cone. Each creature in that area must make a DC 14 Constitution saving throw, taking 32 (7d8) cold damage on a failed save, or half as much damage on a successful one.
Description
Driven from lands farther north by more powerful dragons, an adult white dragon named Cryovain has descended upon the Sword Mountains, claiming the snow-capped range as its domain. Typical of its kind, Cryovain is dim-witted and cruel. The dragon patrols the skies around Icespire Peak, surveying its territory while hunting for food and easy treasure. With each passing day, the dragon’s domain grows as it ranges farther across the land, preying on anything it can catch with its claws or freeze to death with its icy breath. Sightings of the dragon are becoming more common, as are its attacks.
A crumbling fortress on the northeast spur of Icespire Peak serves as the dragon’s lair. Cryovain seized the icy fortress from a tribe of savage orcs, killing the orc war chief and forcing the tribe’s survivors to flee into the foothills and forests. Enraged by the death of their war chief, the orcs have called upon ancient allies — evil, shapechanging, half-orc spellcasters who bless and advise them. These half-orcs worship Talos, an evil god of storms, and many dwell in the dark depths of Neverwinter Wood. In stormy weather, they gather on remote hilltops to summon Gorthok the Thunder Boar, a primal entity that serves Talos. Like the god it serves, Gorthok delights in destruction.
The orcs aren’t the only creatures thrown into upheaval by Cryovain’s sudden arrival. A manticore driven from its mountaintop nest by the roaming white dragon has migrated to the foothills and begun terrorizing folk living on the outskirts of the mining town of Phandalin. Other monsters in the region have been similarly displaced.
Lair and Lair Actions
A White Dragon’s Lair
White dragons lair in icy caves and deep subterranean chambers far from the sun. They favor high mountain vales accessible only by flying, caverns in cliff faces, and labyrinthine ice caves in glaciers. White dragons love vertical heights in their caverns, flying up to the ceiling to latch on like bats or slithering down icy crevasses.
A legendary white dragon’s innate magic deepens the cold in the area around its lair. Mountain caverns are fast frozen by the white dragon’s presence. A white dragon can often detect intruders by the way the keening wind in its lair changes tone.
A white dragon rests on high ice shelves and cliffs in its lair, the floor around it a treacherous morass of broken ice and stone, hidden pits, and slippery slopes. As foes struggle to move toward it, the dragon flies from perch to perch and destroys them with its freezing breath.
Lair Actions
On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can’t use the same effect two rounds in a row:
- Freezing fog fills a 20-foot-radius sphere centered on a point the dragon can see within 120 feet of it. The fog spreads around corners, and its area is heavily obscured. Each creature in the fog when it appears must make a DC 10 Constitution saving throw, taking 10 (3d6) cold damage on a failed save, or half as much damage on a successful one. A creature that ends its turn in the fog takes 10 (3d6) cold damage. A wind of at least 20 miles per hour disperses the fog. The fog otherwise lasts until the dragon uses this lair action again or until the dragon dies.
- Jagged ice shards fall from the ceiling, striking up to three creatures underneath that the dragon can see within 120 feet of it. The dragon makes one ranged attack roll (+7 to hit) against each target. On a hit, the target takes 10 (3d6) piercing damage.
- The dragon creates an opaque wall of ice on a solid surface it can see within 120 feet of it. The wall can be up to 30 feet long, 30 feet high, and 1 foot thick. When the wall appears, each creature within its area is pushed 5 feet out of the wall’s space, appearing on whichever side of the wall it wants. Each 10-foot section of the wall has AC 5, 30 hit points, vulnerability to fire damage, and immunity to acid, cold, necrotic, poison, and psychic damage. The wall disappears when the dragon uses this lair action again or when the dragon dies.
- The dragon summons (1d4), Ice Mephit in an un-occupied space it can see within 120 feet of it. These creatures act on the Lair initiative for as long it they live and attack any creatures hostile to the dragon.
Regional Effects
The region containing a legendary white dragon’s lair is warped by the dragon’s magic, which creates one or more of the following effects:
- Chilly fog lightly obscures the land within 6 miles of the dragon’s lair.
- Freezing precipitation falls within 6 miles of the dragon’s lair, sometimes forming blizzard conditions when the dragon is at rest.
- Icy walls block off areas in the dragon’s lair. Each wall is 6 inches thick, and a 10-foot section has AC 5, 15 hit points, vulnerability to fire damage, and immunity to acid, cold, necrotic, poison, and psychic damage.
If the dragon wishes to move through a wall, it can do so without slowing down. The portion of the wall the dragon moves through is destroyed, however.
If the dragon dies, the fog and precipitation fade within 1 day. The ice walls melt over the course of 1d10 days.
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