Draconic Champion (5e Feat)
From D&D Wiki
Prerequisites: Constitution 13 or higher
A Warrior that has successfully absorbed the power of a dragon.
When selecting this feat, pick a color of a dragon. Upon being hit by a damage of the same type as the color you heal half of the damage instead of take damage, you have advantage against breath/frightful presence of dragons and all damage dealt with non-magical weapons deals the damage of your color and if your weapon is magical then it deals a 1d8 damage of your color.