Mythic Rift enemies
A rift of 100 tiers with enemies at level 70, open only on Inferno. It is entered from The Brave Memorial in the City of Veldak, which is unlocked for 1,000,000 gold at level 70 on Inferno. Each tier makes enemies stronger and raises the gold and experience.
Rift enemies
The rift's regular enemies come from these 37 enemies (size in the rift below each name).
Rift bosses
Its bosses come from these 20 region bosses and mini-bosses.