History of Challenge Mode

Challenge Mode is a raid launch mode in which all encounter challenges are enabled and required. An example is Vault of Glass: Challenge Mode.

Separately, weekly raid challenges are optional restrictions added to one encounter at a time, which must be met to complete the challenge. Rewards vary by raid: in Root of Nightmares, King's Fall, and Vow of the Disciple, completing the Master challenge grants a random Adept raid weapon, while Vault of Glass grants rotating Timelost weapons. Rotations change weekly, so check the current week before planning a run.