So I need some help finding a book. My friend showed me this optional rule for Artificer Infusions that allows me to make any common magic item from Xanathars Guide to Everything, and these creations do not count against total infusions. However I cannot find what book its from and he says that the ruling is in Xanathars however I have not found it at all. To top it off it gives secondary infusion options from something called Pryxis Magic Items but Pryxis seems to be homebrew content. So I'm just wondering if someone can help me find whatever books these are all in and if its Homebrew content or Official content so that I can get these books. For context the optional rule is called: Common Replication.