End the Mana Frenzy

There have been periodic monster raids since the barriers were destroyed. You can stop their raids by collecting the Demonic Manastones, which can be acquired by defeating the Frenzied Demons, and placing them in the Magic Circle. Take part in the Stop the Mana Frenzy event and put an end to their rampage, and you will be rewarded for aiding the Venelux Investigation Team.