It's used in Void Glue (you see this in airship and sub parts still) and some low level alc stuff. It has historically been a pain to get since there is no reliable way to farm mobs for it, and you just have to send your retainers out for what you need. It seems odd to change it at such a late date, but it is nice to have another way to get something that really shouldn't be difficult to get at all.