How to add Random Options(bonus)to drop?

[Azarth]

I wonder if I can make drop from monsters come with those bonus, I dont mind make monster by monster and equip by equip I just need a guide if anyone have one or a willing to do so please let me know, I really dint get those avaible...=/

Like this knife ^^^

[jqkeric11]

 1. rathena-master\db\re\mob_drop

     This is a set mob drop

2. rathena-master\db\re\item_randomopt_group

     This is a set randomopt_group

3.rathena-master\db\re\item_randomopt_db

      This is a set randomopt DB

Edited March 7, 2018 by jqkeric11