Building the Voidforge

I have been considering how I may offer you greater strength, my friend. I've come up with something, but I need your help building a proper Voidforge. What? Oh, fear not, all my ulterior motives are still aligned with your cause. For now. To begin, I need one Elementary Voidcore. You will be able to find shards from the more powerful foes you habitually encounter. Inflict your usual violence, return the shards, and I can weave them back into a true Voidcore to serve as the forge's foundation.