User blog comment:DancePowderer/Deus Ex Lacrima/@comment-4449950-20140209112406/@comment-7418318-20140209114112

There are at least two kinds of Lacrima that are not just batteries.

One would be Dragon Slayer Lacrima, which causes changes to a mages body and the other being used to focus and/or channel magical streams (or whatever you want to call it) like in Jupiter, Nirvana and most likely Etherion.