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 23
A soldier of the Convict Mercenaries who were famous for their bravery during the Aden-Grecia War. Currently, he is the Commander of the Grecia Convict Mercenaries which are the surviving remnants in Aden Kingdom. Leading his subordinates left in Gludio, he is awaiting for an opportunity to return to his country.