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 of the Undead wandering about on the battlefields of the past. He was a general who led an army called Death Blade in the past and slaughtered anything visible. Owing to the petition of the nobles who were afraid of his madness, he was demoted, and later killed with his army in a battle in which he was used as bait. However, even death could not stop his madness for slaughter. He called upon the magic of darkness, and resurrected himself and his army as the Undead. He still threatens the Frontier Post with a shiny blade that never gets rusty.