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
Titan called in by Great Pirate Zaken through using the giant's legacy discovered in Cruma. Since Zaken doesn't trust his inferiors as he was murdered by his inferiors for money before, Titan is in charge of guarding the treasures instead.