Files you must edit are -
for items -
item.bmd
itemtooltip.bmd
item(kor).txt (or item(new).txt , depends on what your server uses .
the client must be configured with more items than there are on the original ( some client dont support extra items so if you got past that part just look at ancient opt.)
Edit these files for custom ancients to apear in client -
ItemSetOption(kor).txt (if you expect to make new ancient set combination)
ItemSetType(kor).txt
itemsettype.bmd
ItemTooltip.bmd (not sure if anything there.....just check what other acc has and what not )
ItemTooltipText.bmd ( if it has new options like 50% double dmg etc. so that it apears in the client and shown properly but its harder to find the correct ones , i myself dont have a clue how to work with that )
The most important thing is so that the files in client are properly configured otherwise you wont be able to see the ancient options , just go through forums see how they do it and the answer is it does work
a friend of my has ancient items custom with his options in it , new sets + ancient options