As many have noted the difficulty of Conquests has been adjusted. For some it will feel like a significant increase and that is because before there was basically no difficulty. Conquests on all settings had a success rate of over 90%. One of the goals here is to have the difficulty be such that success is not guaranteed otherwise there isn't much of a challenge. If previously your gladiators were walking through Nightmare and now they are having trouble I suggest selecting the Hard difficulty instead and work your way back up to Nightmare. Another key to Conquests is choosing the right allies. Keep trying different combinations.

Keep the feedback rolling in, it is always helpful.

Good luck in the Pit!

-Nate-