Well if your into the whole entire making your guys little onion knights of utter death on a mass scale, then you need this stuff. If not then just don't even try. Its a lot like getting the adamant in FFIV, your chances of getting 1 is rare, let alone all the peices for every charcter. The only way to get it is to kill certain monsters in the tower. I know that most of the dragons in there have one kind of the onion equipment on them. That's all I really know though, never bothered to even try and get one onion equipment peice.