This will craft the Troll's Visage, which will allow you to share your Thaumcraft research with others.First, use a Crystal Core to draw a Dark Node directly over your Crucible. Throw another Crystal Core, your Thaumonomicon, then your Wand of the Thaumaturge into your Crucible, in that order.
I claim no responsibility if you actually take that seriously.
No, if you haven't "unlocked it" yet, you cannot discover it.Hmm, if you give a theory to somebody who doesn't have its prerequisites, can they add it to their notebook, and can they build the device? (If the components they can't make are given to them by someone else too.)