This mod adds in 101 moded helmets. Each helmet has power held in each. Most you can figure out by your self. The few that are a little bit different are the Skeleton, Overworld, Nether, and End. The skeleton's is when you hold a bow it shoots limitless arrows and doesn't break the bow. The Overworld, Nether, and the End switch to that world by holding seeds, nether quartz, and an eye of ender. You mite want to download the Not Enough Items mod for 1.8.