Seasonal and Rift progression
Greater Rift keystones
Greater Rift Keystones open Greater Rifts, where players level Legendary Gems and push endgame tiers.
Rift Guardians at the end of Nephalem Rifts opened from the town Obelisk in Adventure Mode.
Repeat Nephalem Rift Guardian kills as often as needed; keystone drops are chance-based, and each key is spent when opening a Greater Rift.
Stop collecting when you have enough keys for the next gem leveling or tier push session; switch to a different activity if your build or Greater Rift access is the limiting factor.
Open a guide to find other locations and see what the item is used for.
Greater Rift Keystones open Greater Rifts, where players level Legendary Gems and push endgame tiers.