Board Thread:Game Discussions/@comment-27862737-20170404193851/@comment-27862737-20170404193957

And my response, from that same page (now deleted):

To answer your question, there are no guarantees on combining/fusion; it's entirely random and is not based -- as far as anyone can tell thus far -- on any element combinations. I have personally fused a Dual Air Dragonforged (Accursed Dregmail, regular version) using two Epics that did not have any Air at all (F/E and W/E, if I remember correctly).

HTH.

-M