Board Thread:Game Discussions/@comment-209.91.107.193-20140809144200/@comment-3100871-20140811214949

Personally, I keep an EB of each element combination (not what everyone does, but just a personal choice for me.  Increased flexibility for EBs). I don't fuse away an EB until I get a better EB of the same element combination (or the extremely rare Epic).

And so B Legit and Anon above are right. Don't gamble something that you'll miss. It'll make it difficult to recover. And your best bet for getting epics is farming Kingdom of Darkness Epic for 3-star (which is long term trash) and fuse those to get 4-Stars (not guaranteed, but good shot). Those will almost always be worse than any EBs you have. Which makes them your best source for Epic Fusion Fodder.

Plus, when you're farming KoD Epic for 3-star mats, you'll be prime for starting toward EB+s, which will give you even more 4-Star fusion fodder.

Good luck, and may the RNG ever be in your favor. :P