Attribute Trial Fever is available under “Logres” tab’s time-limited Events quests.
15-minute “Fire“, “Water“, “Wind“, “Earth“, “Light“, “Dark” Fever Trials will be available daily. This single-stamp battle against 5 smaller and relatively weaker Incarnates is a great way of collecting Particles with great haste.
Clearing an Attribute Trial Fever for the first time rewards you with a single Crystal but since the Incarnates could easily be slayed, farming Particles and Incarnate Treasure boxes would be a breeze if you keep on repeating the Trial Fever Quest.
7/12/2018 (THU) after maintenance ~ 7/18/2018 (WED) 14:15 (PST)
2:00 ~ 2:15 / 6:00 ~ 6:15 / 10:00 ~ 10:15 / 14:00 ~ 14:15 (PST)
※Note that the Maintenance Schedule, Event Period, and Contents may change without prior notice.