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 39
The spider that used to live in the Wasteland before Beleth was sealed. After Beleth was sealed, it was driven away by Ants whose power sharply grew thanks to the magic power in the Wasteland, and had to retreat to this place now. Swearing to overthrow the Ants someday, it is quietly growing its power and sharpening its blade of revenge.
объясняю по понятному языку, от охраны два паучка красного цвета дают возвратку - их надо убить первыми по асисту, а потом может лить рб если пауки успели кинуть возвратку то тут ужу лучше подождать или снять бафы с рб ССом.