Higher Greater Rifts levels are progressively more difficult.You cannot use player banners or the Teleport option if the target player is in a Greater Rift.

Note that if you die in a Greater Rift on a Hardcore character, that death will be permanent.

You cannot resurrect at your corpse or in town while in a Greater Rift-only at the last checkpoint.

Monsters grant differing amounts of progress for your progress bar the tougher the monster, the more they fill up your progress bar.

This removes conflicting pressure from attaining a better time versus picking up all your loot.

Most monsters do not drop loot rewards have been completely shifted to the Rift Guardian.

You'll race against a clock to fill a progress bar by accruing monster kills.

While Greater Rifts are a type of Nephalem Rift, there are some key differences between the two features. If you have members in your party, each player will be prompted to use one of their own Greater Rift keys to join the fun! You can then use this new key at the Nephalem Obelisk, similar to other Rift Fragments-this will open a Greater Rift. When you defeat the Rift Guardian, they'll have a chance to drop a Greater Rift Key.

To access a Greater Rift, simply complete a regular Nephalem Rift in any difficulty. Formerly referred to as Tiered Rifts, Greater Rifts are a special type of Nephalem Rift that are designed to provide players way to measure their gear progression and efficiency.

Diablo 3 wiki greater rift