Board Thread:Game Discussion/@comment-23971626-20131005150826/@comment-24003266-20131006003743

Don't fuse Rockfeather until you release the + version at level 20. Your best bet is to level up the big four + armors if you haven't yet completed all the adventure levels; this will help you complete these levels and start farming for materials to craft the bigger four + versions. This strategy will also help you beat the Epic Bosses more easily to get those Legendary sets.

Fusion is a complete luck fest, NEVER fuse your best armors! Build up your quiver of 4* armors before you start your fusion experiments...