Ancient Silver Dragon

+7

Arcana: The monster's treasure hoard features magic items with the noted theme. The Dungeon Master's Guide details treasure hoards appropriate for each theme.

If the dragon fails a saving throw, it can choose to succeed instead.

5/DAY

The dragon makes three Rend attacks. It can replace one attack with a use of (A) Paralyzing Breath or (B) Spellcasting to cast Ice Knife (level 2 version).

Melee Attack Roll: +17, reach 15 ft. Hit: 19 (2d8 + 10) Slashing damage plus 9 (2d8) Cold damage.

Constitution Saving Throw: DC 24, each creature in a 90-foot Cone. Failure: 67 (15d8) Cold damage. Success: Half damage.

D5

Constitution Saving Throw: DC 24, each creature in a 90-foot Cone. First Failure: The target has the Incapacitated condition until the end of its next turn, when it repeats the save. Second Failure: The target has the Paralyzed condition, and it repeats the save at the end of each of its turns, ending the effect on itself on a success. After 1 minute, it succeeds automatically.

The dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 23, +15 to hit with spell attacks):

• At will: Detect Magic, Hold Monster, Ice Knife (level 2 version), Shapechange (Beast or Humanoid form only, no Temporary Hit Points gained from the spell, and no Concentration or Temporary Hit Points required to maintain the spell)
• 1/day each: Control Weather, Ice Storm (level 7 version), Teleport, Zone of Truth

The Ancient Silver Dragon can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The Ancient Silver Dragon regains spent legendary actions at the start of its turn.

3/TURN

The dragon uses Spellcasting to cast Hold Monster. The dragon can't take this action again until the start of its next turn.

Dexterity Saving Throw: DC 23, each creature in a 60-foot-long, 10-foot-wide Line. Failure: 14 (4d6) Cold damage, and the target is pushed up to 30 feet straight away from the dragon. Success: Half damage only. Failure or Success: The dragon can't take this action again until the start of its next turn.

The dragon moves up to half its Speed, and it makes one Rend attack.

Silver dragons typically lair in picturesque mountain retreats or on sculpted cloud "islands." The region containing an adult or ancient silver dragon's lair is changed by its magic, creating the following effects:

Gentle Gusts: Winds buoy creatures that fall within 1 mile of the lair. Such creatures descend at a rate of 60 feet per round and take no damage from falling.

Sun and Storms: While in its lair, the dragon can cast Control Weather, requiring no Material components and using the same spellcasting ability as its Spellcasting action.

If the dragon dies or moves its lair elsewhere, these effects end immediately.