Arawn’s Flipped Odds

You reach into a targets history and call forth a ghostly image, bringing that creatures heroic destiny to the present. The target becomes surrounded by a cloak of energy that appears as their natural form, but stronger and more capable. The target gains 10d6 temporary hit points. While it has these temporary hit points, the first time it successfully hits with an attack on its turn is a critical hit. Additionally, any critical hit against it becomes a regular hit instead. If these temporary hit points are removed by damage, the creature that removed them takes 5d6 radiant damage, and your original target may use its reaction to make a single weapon attack agaisnt the creature that damaged them.