Fighter/11th/Darknut

Body Blow

At 11th level, you learn to put the weight of your body and armor into your strikes. Whenever you hit with a target strike, you can add your Constitution modifier to the damage dealt. Objects and structures are vulnerable to the damage from your target strikes.

Steadfast

At 11th level, you learn to stand your ground with superhuman moxie. While you are wearing your darknut armor, you have advantage on any Strength ability check or saving throw made to avoid being moved or knocked prone.