Hope this helps about your category question...info at
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Information about category:
Only one drop will be given per category, except in the cases when category is -1.
Category -1 is used for SPOIL/SWEEP drops only! Do NOT change this.
In general, category 0 is for adena and 1 seal stone color (each seal stone color should be in a different category).
In general, category 1 is for full drops and parts of equipable items. However, you can change this.
In general, category 2 is for all other items. However, you can change this.
In general, more categories are only used for RBs who have 1 item per category (i.e. do not really drop categorized),
with the sole exception of category 200 that is used for Life Stones. However, you can change this too.
You can create more categories as you see fit. Just make sure the "category" number is non-negative!!
Also, it is NOT a problem if category numbers are skipped (so you can have -1, 1, 5, 10 as your categories).
If you wish to allow more than one item to be given from the same category, you can
split them up over several categories.
In addition, RBs and Grandbosses (mainly) may have the exact same item repeated in multiple categories.
This allows mobs to give 1 copy of the drop to each of several people (if they are lucky enough to get the drops).
Calculation for each drop, when in categories, is equivallent in chance as when outside of categories.
First, the sum of chances for each category is calculated as category chance. If the category is selected
for drops (i.e. its chance is successful), then exactly 1 item from that category will be selected, with
such a chance that the overall probability is maintained unchanged.