Board Thread:General Discussion/@comment-26942450-20151107215044/@comment-2189621-20161010215531

The best thing I can think of is for Expert mode, instead of the towers dropping fragments, they drop a goodie bag that contains a special luminite bar of their respective element (Vortex Luminite, Solar Luminite, Stardust Luminite, And whatever the pink one was called), which creates better gear than the normal fragment gear.