Terminus is a game mode in which the goal is to make it round 12 and win. You get 3 preselected (but randomly chosen) decks to get there with, and you lose a deck every time you lose a fight. The part that makes it especially difficult, however, is that you automatically lose the deck you are playing with after round 4 and 8. This means that to complete round 12, you must make it there without losing a single fight. There is also a bonus round 13 with a special deck, and you win enormous prizes if you can win that fight. The prizes naturally become larger as you progress further.