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
A by-product created by the ancient mystics of the Ivory Tower while they were investigating the Secrets of Infinite Flame contained in the flame stone and known to control the Spirits of Flame. It was considered as a failure and discarded, but it came to life again. Having wandered about near the Ivory Tower and interfering with innumerous Spirits of Flame, it has become the major headache of the mystics.