Sleepwalker's Flight: Soul Gems event

Referring to the AGG chinese wikia, the coming Sleepwalker's Flight will be a soul gem event. Like last year legendary goddess Valkyrie, you have to discover soul gems through the quests and battle against other ghost agents to to complete the gem series. The goal for this challenge is to complete the gem series as many times as you can and you will get a reward card after completing certain number of gem series.