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 Warrior competing against other leaders of the bandits over Oren’s Bandit Stronghold. He cannot personally perform spells, but has profound knowledge about magic and spells and leads superior Shamans as his inferiors. As an Oel Mahum, he is rather prudent and timid.