Adult Song Dragon

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

Magic Resistance. The dragon has advantage on saving throws against spells and other magical effects.

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: +11 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 4 (1d8) lightning damage.

Claw. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing 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 16 Wisdom saving throw or become frightened of the dragon 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.

Ionized Breath (Recharge 5–6). The song dragon exhales a blueish cloud of gas flickering with tiny lightnings in a 60-foot cone. Nonmagical fires in the area are snuffed out, and illusions caused by spells of 3rd level or lower are dispelled. Each creature in that area must make a DC 18 Dexterity saving throw, taking 54 (12d8) lightning damage on a failed save, or half as much damage on a successful one.

Change Shape. The song dragon transforms into a Medium Humanoid of CR 14 or lower, or back into its true form. The dragon decides whether any equipment worn or carried is dropped or melds with its new form. In either shape, the dragon keeps its alignment, Intelligence, Wisdom, and Charisma scores, known languages and proficiencies, Legendary Resistances, Magic Resistance, damage and condition resistances and immunities, and this bonus action. It also keeps its Legendary Actions, but can only use the Detect option. When it drops to 0 hit points in its Humanoid body, it transforms back into a Dragon, with any remaining damage carrying over into its new form. After its Humanoid form is reduced to 0 hit points, the song dragon loses this bonus action until it regains all its hit points in its true form. The song dragon doesn't die until reduced to 0 hit points in its true form.

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) or Intelligence (Insight) check.

Tail Attack. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage.

Wing Attack (Costs 2 Actions). The dragon 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 immediately fly up to half its flying speed.