Mithril Dragon Mutation

Your body lightens and hardens like polished mithril, and your presence carries the weight of calm authority rather than threat.

• Mithril Form. Your body becomes unnaturally light and resilient. You gain resistance to slashing damage. In addition, your speed increases by 10 feet, and opportunity attacks against you are made with disadvantage.

• Aura of Equilibrium. You emanate a stabilizing presence in a 10-foot radius. Hostile creatures in the area have disadvantage on attack rolls made as part of reactions and on the first attack roll they make on their turn if that attack is made with advantage.
In addition, creatures in the area (including you) have advantage on saving throws to end the charmed or frightened condition.