Young Dawn Dragon (5e Creature)
From D&D Wiki
Young Dawn Dragon
Large dragon, lawful good
Saving Throws Dex +5, Int +5, Con +9, Cha +7
Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 15 (2d10 + 4) piercing damage.
Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.
Breath Weapons (Recharge 5-6). The dragon uses one of the following breath weapons.
Radiant Dawn. The dragon exhales a holy light in a 30-foot cone. Each creature in that area must make a DC 15 Constitution saving throw. On a failed save, a creature takes 54 (12d8) radiant damage and is blinded until the end of its next turn. On a successful save, a creature takes half as much damage and is not blinded.
Thanks to the creator of https://www.dandwiki.com/wiki/Young_Iron_Dragon_(5e_Creature) as I have copied his Charming Breath word by word.