Iron man can form a variety of different shields, with his new and advanced nano tech mark 50 armor. This is enabled due to the Nanoparticles, that can together change the armors shape. The shield can take various forms and sizes including, Heater, disc shaped (similar to Captain America's Vibranium shield) etc.

The shield was strong enough to block the beams from the power stone, which has the power to destroy planets.