It's pretty simple, here's a walk-through on how:
(Server sided) 1.) Look through the system files for 'droptable.xml'. This file lists all the items that the quest NPCs drop.
2.) Open up the 'zitem.xml' file in there as well. This will show you all the item id codes you need.
3.) In 'zitem.xml', search for an item you can test. Such as a Peacemaker x2. (Alt+F to search for the text string)
4.) Once you find the name, you should see the following:
Code:
<ITEM id="67819" name="Peacemaker x2"
5.) Copy the item id number (mine is 67819, yours should be a different number).
6.) Go into the 'droptable.xml'
7.) For this example I'll replace some item in the Superion/Super Skeleton boss quest with the Peacemaker x2s.
8.) You might have to translate some crap into english to see what boss is what. (
http://translate.google.com/translate_t#)
9.) After looking down at the bottom and some translation, I found Superion.
Code:
<!-- 슈페리온(보스) -->
<DROPSET id="37" name="S37">
Translated:
"- Syuperion (boss) -"
<DROPSET Id="37" name="S37">
10.) Replace the Peacemaker x2 item id code with one in Superion's drops.
Code:
<!-- 슈페리온(보스) -->
<DROPSET id="37" name="S37">
<ITEMSET QL="0">
<ITEM id="200042" rate="0.40" /> <!-- 리치의 꼬리 -->
<ITEM id="200004" rate="0.20" /> <!-- 찢겨진 65페이지 -->
<ITEM id="400511" rate="0.10" rent_period="168" /> <!-- 남성용 어둠의군주 바지 -->
<ITEM id="400512" rate="0.10" rent_period="168" /> <!-- 여성용 어둠의군주 바지 -->
<ITEM id="400508" rate="0.20" rent_period="168" /> <!-- 재앙의 날개 -->
</ITEMSET>
To:
Code:
<!-- 슈페리온(보스) -->
<DROPSET id="37" name="S37">
<ITEMSET QL="0">
<ITEM id="200042" rate="0.40" /> <!-- 리치의 꼬리 -->
<ITEM id="67819" rate="0.20" /> <!-- Peacemaker x2 Revolvers -->
<ITEM id="400511" rate="0.10" rent_period="168" /> <!-- 남성용 어둠의군주 바지 -->
<ITEM id="400512" rate="0.10" rent_period="168" /> <!-- 여성용 어둠의군주 바지 -->
<ITEM id="400508" rate="0.20" rent_period="168" /> <!-- 재앙의 날개 -->
</ITEMSET>
rate="x" is the drop rate of the item. In my example it's at 20%.
rent_period="x" is self explanatory; it gives the item a rent period.