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
Oel Mahum Lord who owned a Bandit Stronghold once. Fed up with the repeated competition, he came out of the stronghold along with his inferior seers and prefects, and is looking to take back the stronghold.