User blog comment:DragonNotHentai/Myrtenaster! Blog the 4th./@comment-4403232-20130220230023/@comment-5726563-20130222011731

That's what i was thinking. Most likely it is the physical form of magic, posssibly used in forging this weapon or as a rechargeble material for using her spells. I don't think it is reloadable simply because there was no specific spot to place a clip, but i may be wrong.