[Help] drop of items / monsters in the spots season 12

[clonelima]

I am using the files season 12 igcn and I am in doubt on the drop of items in the monsters, all the monsters are dropping the same items and I need to configure it, remove some item from the drop of monsters and put new items to drop the monsters, but not I know where to do this, can anyone here help me?

I want:

Remove drop items from monsters
Add items to the monsters drop

Example:

I want to change the drop of monsters from the Land of Trials map, there are dropping items like leather and I want to drop the monsters only jewels, where do I set this up?

[MentaL]