Devil challenge is an event opened during 21:30-21:45 each day. Every player can participation in the challenge of incarnate fiend and get rewards based on the damage to the fiend.
After daily challenge ends, player who dealt the most damage will get abundant rewards. If current incarnate fiend is defeated, the player who is top 1 in the damage ranking will become new incarnate fiend for player to challenge on the second day in the meantime.
Before the challenge of the current incarnate fiend begins, players can choose one player you think will become the new incarnate fiend. If he becomes the incarnate fiend at last, players who choose him will get extra bonus.