Akris drop argates?

open your monster.csv and scroll to your RIGHT.

i'm going to use the very first line, spider larva

(always refer to itemset.csv to check which items belong to that particular set)

1] itemsetindex_1 says 700 it means the drop will come from one of the 700 item set (itemset.csv pls)
2] itemsetdropratio_1 says 12000. remove 3 zeros (which are there just to confuse you) then you get 12%.
--> this is what it means, for every spider larva that you kill, you have a 12% to chance to get an item from set index 700 (it's a set, so there's usually more than one item. the rate of which is further specified in your item.csv)
3] itemsetindex_3 says 1 meaning the drop will come from one of the items belonging to set 1
4]itemsetdropratio_3 says 7080 => 7.8%

so what you have to do to make your mobs drop 145 weaps is to find out which set contains those items. you can use a6 itemset.csv file if you are lazy. just look for one set containing those drops--one for weaps and one or more for gears, then replace the above 700 with that set index to make armors or weaps drop from spider larvae, and you have a 12% chance to get a 145 weap or 130 armor from each kill.