I am trying to complete the mission "Fuse Justicar" and between the Diabolist and the Warmaiden; I've spent almost 3000 energy and 2 days farming on Brutal.  (only gotten the Diabolist so far).  For a couple champions rare champions that are just going to be fused, this is way too much time and energy.  I really think the drop rates of champions in campaign, and especially the rarity rate on brutal needs to be addressed.  This is ridiculous.