Oooh what if they had a forge-type customization for that horde mode, similar to the new Doom's system. I wanna be able to choose what map, what area of that map, and what enemies spawn where. [spoiler]id just make a long hallway with infinite thralls. Bad juju party. [/spoiler]

Yeah that's what my friend and I thought prison of elders was. It was pretty annoying to do back then because of the sometimes insane difficulty but it's just easy and fun now. That said I wouldn't mind an updated prison in addition to a horde mode