Of all my expert runs in expert COB: My first 3 or 4, which I only killed just as many bosses solo in, gave an adept. My next 2 solo gave none. My next 4 or so in a group gave 1, between silver and gold tier rewards. My next 6 or so of getting all 13 kills, I only got an adept maybe 4 of them. Either full runs in the Nether and COB should guarantee an adept, or players should have a way of increasing their chances because this doesn't feel worth it. Nether is technically the highest level activity in the game, and COB is a boss rush with mechanics that can screw you over big time. The rewards should reflect that. I'm not saying to drop shiny weapons rapidly, just adepts.