If the level of the person who made the greatest contribution is higher than the level of the raid monster by 3 or more levels, then the probability of dropping an item or adena will decrease. If the level difference is nine or more levels, then, the monster will not drop any item or adena.
Raid Boss - Level 33
Great Seer leading Vuku Orcs. He has more power than Chief Driko, and is held in high esteem as a god-like being. He feels sorry for his tribe wandering about in the human world and getting disdainful treatment at present. He is trying to take the tribe and return to the northern area which is the land of Orcs.