The Challenge system, typically found below your minimap, consists of a Daily Challenge as well as a Weekly Challenge. Completing a certain number of challenges will yield you treasures such as Reputation and upgrade materials. Daily Challenges are reset every morning at 6 AM (server time) while the Weekly Challenges are reset on Wednesdays at 6 AM (server time). If you miss to complete the Daily Challenge, you will instead stack Rest Rewards. Rest benefits can stack for up to 2 days and can be claimed by completing a Daily Challenge.