The crafting recipes you're talking about are from 6.0 and use materials from the new castle system, and they take alchemy proficiency.
Frankly speaking, infusions for erenor shouldn't be added in the first place and the cap for infusing should never be raised to 6 at at time. With the reduced exp cost already it'll make it FAR too easy for people to get eternals without much effort, it'd be very bad for server health. And since future patches are being brought up there's a series of bugs in upcoming patches relating to erenor that need to absolutely be fixed since I know several people ready to abuse them:
-In one of the upcoming patches you can feed lower tier erenor infusions into higher tier erenor gear, allowing you to immediately go from nothing all the way up to eternal using just celestial erenor infusions.
-Opening up the menu that lets you infuse, putting one item or infusion in, and then clicking the honor store button will let you re-insert it multiple times (giving you 6x from just 1 item when the game starts letting you infuse 6 at a time).
-If you open the infuse menu next to a dungeon, put your infusions into the menu, "create" the dungeon instance, and then hit the infuse button so that the cast bar starts right before you hit the loading screen it'll infuse them but not take any of the items away. So you can just freely re-infuse them and abuse that.
@Sparkle @Sjinderson I hope these bugs and the many others that are very well documented from live are fixed so that when these patches come they can be fixed prior.