Talk:Underworld/@comment-110.93.86.13-20171105131733/@comment-31479589-20171105230528

Just beat the raid bosses, they will drop the key required to fight the next boss.

For Volcano keys, if you have less than 5 keys, they will be refreshed to 5 at the beginning of each season.

Speaking of season, you'll rewarded with some raid keys at the end of each season.