[How]Help

I need to know how a "Spider Larva" should drop a DN item full FS +12.

i saw alot of guide but i'm really confused,

can u guys Explain me how i can do it? thx.

goto share/item/itemset.csv, and change or add a new itemset that includes the items you want, and then go to share/item/monster.csv and add the itemset at spider lavra.