Power armor

Power armor is the peak of protection gear ever developed on the battlefield. It's a fully enclosed mechanical suit said to be "equivalent to a one-man tank."

In order to equip the armor, it must be entered from the outside, which then causes the suit to unfold to accept an occupant, then reseals itself. In order to operate properly power armor requires the use of a fusion core.

Power armor not only grants its wearer extended mechanical protection, but also gives them superior strength. The armor allows the wearer to fall from great heights without suffering any damage and simultaneously causes damaging shock waves to anything unfortunate enough to be close by.

Though there are a number of people who use power armor, it's most commonly associated with the Brotherhood of Steel, who own a large amount of them.