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
Commander who has led Ketra Orcs for a long time. He is a merciless and reckless player who enjoys gambling. Rather than elaborate plans, he personally leads his inferiors in the front line, marches into the enemy’s post, and tramples on the enemy. He is faithful to his instincts. He is keeping the score of one win against one defeat with Varka's Commander Mos.
Ketra`s Commander Tayr
Вообщем так себе ...