Adult Red Dragon

The dragons spellcasting ability is Charisma (save DC 19). It can innately cast the following spells, requiring no material components.
- 3/Day Each:Command, Hold Person, glyph of warding, Wall of Fire

When the dragon fails a saving throw, it can choose to succeed instead. When it does, it sheds some of its scales, which turn to sand. If it has no more uses of this ability, its Armor Class is reduced to 17 until it finishes a long rest.

A creature that touches the dragon or hits it with a melee attack for the first time on a turn takes 7 (2d6) fire damage.

The dragon is immune to the effects of poisonous gases caused by volcanic environments. It also ignores difficult terrain caused by lava.

Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 24 (3d10 + 8) piercing damage plus 4 (1d8) fire damage.

Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 21 (3d8 + 8) slashing damage.

The dragon exhales a blast of fire in a 60-foot cone. Each creature in that area makes a DC 21 Dexterity saving throw taking 73 (21d6) fire damage on a failed save or half damage on a success. A creature that fails the saving throw also takes 5 (1d10) ongoing fire damage. While affected by this ongoing damage it is frightened of the dragon. A creature can use an action to end the ongoing damage.

The dragon attacks once with its bite and twice with its claws. In place of its bite attack it can Spit Fire.

The dragon targets a creature within 60 feet forcing it to make a DC 21 Dexterity saving throw. The creature takes 22 (4d10) fire damage on a failure or half damage on a success. A creature that fails the save also takes 5 (1d10) ongoing fire damage. A creature can use an action to end the ongoing damage.

Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage and the dragon pushes the target 10 feet away.

When a creature the dragon can see within 10 feet hits the dragon with a melee attack, the dragon makes a tail attack against it.

The dragon uses its Cruel Tyranny action.

Each creature of the dragons choice within 120 feet that can hear it makes a DC 19 Charisma saving throw. On a failure, it is frightened for 1 minute. A creature repeats the saving throw at the end of its turns, ending the effect on itself on a success. When it succeeds on a saving throw or the effect ends for it, it is immune to Roar for 24 hours.

Only one legendary action can be used at a time and only at the end of another creatures turn. It regains spent legendary actions at the start of its turn.

The dragon beats its wings. Each creature within 15 feet makes a DC 21 Dexterity saving throw. On a failure, it is pushed 10 feet away and knocked prone. The dragon can then fly up to half its fly speed.