I get the feeling that the OP wants say a weapon that will be relivent until the next expantion that needs 50,000 items to obtain/upgrade that has a 0.1% chance of dropping 1 to 3 items from a fate which has 15% chance of poping each hour, which is basicly how FFXI did it, well if you ask me this is not FFXI this is FFXIV, which caters for a diffrent user base