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
Leader of Mineral Spring Yetis living in the hot spring area. He is arrogant enough to call himself Icicle Emperor, but is in fact a coward. He marched into Fire Dragon Valakas’ nest once to prove his strength, but got scared and ran away when he saw Valakas sleeping. He is extremely afraid of Valakas, and runs away out of horror if he hears a roaring sound.