I would like to see a true Prison of Elders Horde Mode. One where it doesn't end after three encounters. It just keeps getting harder and crazier each round until you wipe. Tetris mode. No Bosses. just more Majors and Ultras the higher you get No mines to defuse, or other junk. No "burns". Just run and kill or be killed. Wave after wave of endless bullets. Rewards would be based on final round you wiped on. Edit: it would default start on Level 4 enemies. I know, that would be way easy, but it could be a way for new guardians to learn the mechanics and for teams to test new strategies. You could choose to start at any level, in increments of 5. Example: opening menu to the arena would have a scroll bar for level 5,10, etc, up to 40. (Or whatever is the current highest level)