Ancient Silver Dragon 20th Level Sorcerer

Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Draconic Resilience. The Silver Dragon gains an additional hit point for every hit die it has over its usual constitution modifier.

Elemental Affinity. The Silver Dragon adds its charisma modifier to one roll of spells it casts that deals cold damage.

Spellcasting. The Silver Dragon is an 20th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 22, +14 to hit with spell attacks). It can cast these spells with no material component. The Silver Dragon has the following sorcerer spells prepared:

Cantrips (at will): ray of frost, frostbite, shape water, prestidigitation, message, mage hand

1st level (4 slots): chromatic orb, shield, detect magic

2nd level (3 slots): enhance ability, detect thoughts

3rd level (3 slots): protection from energy, counterspell

4th level (3 slots): polymorph, ice storm

5th level (3 slots): cone of cold, teleportation circle

6th level (2 slots): globe of invulnerability

7th level (2 slots): plane shift

8th level (1 slots): dominate monster

9th level (1 slots): time stop

Metamagic. The Silver Dragon can twist its spells to suit its needs. It has the following Metamagic options available, and has 20 sorcerery points.

Quickened Spell. When the Silver Dragon casts a spell that has a casting time of 1 action, it can spend 2 sorcery points to change the casting time to 1 bonus action for this casting.

Careful Spell. When the Silver Dragon casts a spell that forces other creatures to make a saving throw, it can protect some of those creatures from the spell’s full force. To do so, it spends 1 sorcery point and chooses a number of those creatures up to its Charisma modifier (minimum of one creature). A chosen creature automatically succeeds on its saving throw against the spell.

Twinned. When the Silver Dragon casts a spell that targets only one creature and doesn’t have a range of self, it can spend a number of sorcery points equal to the spell’s level to target a second creature in range with the same spell (1 sorcery point if the spell is a cantrip).

Heightened Spell. When the Silver Dragon cast a spell that forces a creature to make a saving throw to resist its effects, it can spend 3 sorcery points to give one target of the spell disadvantage on its first saving throw made against the spell.

Sorcerous Restoration. The Silver Dragon regains 4 expended sorcery points whenever he finishes a short rest.

Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +18 to hit, reach 15 ft., one target. Hit: 21 (2d10 + 10) piercing damage.

Claw. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 17 (2d6 + 10) slashing damage.

Tail. Melee Weapon Attack: +18 to hit, reach 20 ft., one target. Hit: 19 (2d8 + 10) bludgeoning damage.

Frightful Presence. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 22 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.

Breath Weapons (Recharge 5–6). The dragon uses one of the following breath weapons.

Cold Breath. The dragon exhales an icy blast in a 90-foot cone. Each creature in that area must make a DC 25 Constitution saving throw, taking 67 (15d8) cold damage on a failed save, or half as much damage on a successful one.

Paralyzing Breath. The dragon exhales paralyzing gas in a 90-foot cone. Each creature in that area must succeed on a DC 25 Constitution saving throw or be paralyzed 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.

Change Shape. The dragon magically polymorphs into a humanoid or beast that has a challenge rating no higher than its own, or back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (the dragon's choice).

In a new form, the dragon retains its alignment, hit points, Hit Dice, ability to speak, proficiencies, Legendary Resistance, lair actions, and Intelligence, Wisdom, and Charisma scores, as well as this action. Its statistics and capabilities are otherwise replaced by those of the new form, except any class features or legendary actions of that form.

Draconic Presence. The Silver Dragon can spend 5 sorcery points to draw on this power and exude an aura of awe or fear (its choice) to a distance of 60 feet. For 1 minute or until it loses its concentration (as if it were casting a concentration spell), each hostile creature that starts its turn in this aura must succeed on a Wisdom saving throw or be charmed (if it chose awe) or frightened (if it chose fear) until the aura ends. A creature that succeeds on this saving throw is immune to the Silver Dragon's aura for 24 hours.

The dragon 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. The dragon makes a Wisdom (Perception) check.

Tail Attack. The dragon makes a tail attack.

Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 25 Dexterity saving throw or take 17 (2d6 + 10) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.