Sapphire Dragon Mutation

Your body resonates with deep, grinding vibrations, and your presence disrupts movement, magic, and resolve.

• Resonant Shockwave (Action). You release a concussive burst of thunderous force in a 15-foot cube originating from you. Each creature in the area must make a Constitution saving throw (DC = 8 + your proficiency bonus + your Constitution modifier). On a failed save, a creature takes 7d8 thunder damage, is pushed 10 feet away from you, and can’t take reactions until the start of its next turn. On a successful save, a creature takes half as much damage and isn’t pushed or prevented from taking reactions.
You can use this ability a number of times equal to your constitution modifier.

• Saphir Scales. You gain resistance to thunder damage. Additionally, when a creature is pushed, knocked prone, or moved against its will by you, its speed is reduced by 10 feet and it has disadvantage on the next Constitution saving throw it makes before the end of its next turn.