Superhero Power Mystery Boxes

Each time you login to play, could there be a magic mailbox of some sort that you can hunt for and find, and inside is a different superpower that will help you. It could be something different each time, but it would be fun to search for these boxes and find them. Some of the super powers could be the ability to fly (in survival), laser eyes, javelin fingers, holding your breath under water for a long time, etc. 

Also, it'd be cool if these boxes had portals inside them so you could go to different places.