A tiered rift system that becomes increasingly difficult as you advance. An "endless dungeon" of sorts.

• Chance at receiving a "greater rift key" when completing a normal rift.
• Finishing a greater rift unlocks an even harder rift. Clearing that rift unlocks another, so on and so on.
• Play and complete harder and harder rifts until you fail.
• Your progress will be ranked on a leader board