One of the best armor of Iron Man is the Mark L suit. It was built after the Iron Man Armor: Mark XLVII, XLVIII, and XLIX. It is used to battle Thanos along with his allies. This armor is the first armor to utilize nanotechnology to create weapons. The Mark L Armor is much stronger than any of the previous armor. It was strong enough to lift entire chunks of building-sized structures with ease, as it enables him to lift and drop a massive pillar of a building on Thanos.