In Campaign Mode, it is two separate dungeons, each one level, but in Adventure Mode, it is a single two-level dungeon. Each Hell Rift is guaranteed to have a Super Unique Mallet Lord guarding it. Inside there are Rift Oculi, which sustain the portals leading to High Heavens. Through the Rifts, demons from the Realm of Terror send reinforcements to assault the Gardens of Hope. Hell Rifts may appear as a layout for Nephalem Rifts. In Adventure Mode, this zone has two levels.