At the moment, I am playing a Twilight "inventor" Exalted in a campaign. As it progresses, I would like to start to dabble in the art of making Artifacts, especially with evocations. So as a result, I will soon have to invent evocations of my own to fit for them, but this becomes a challenge that I fear to tackle alone.
While the general building rules are pretty much straight forward under craft, the rules about evocations on p612 of the 3rd Edition rules doesn't tell about how to design them, but mainly who can use those evocations presented in the book. The only guideline about power and number given is:
• Evocations vary in number and power from artifact to
artifact. The more powerful an artifact (as indicated by
its dot rating), the more powerful and numerous its
Evocations tend to be, though there are no hard and fast
guidelines. Artifact ••• is the lowest rating at which an
artifact is capable of producing Evocations.
I am aware of the Artifact workshop in the OPP-Forum, but this doesn't seem to follow any set guidelines that I could manage to sieve out of (currently) 42 pages.
So, did I miss something about how to invent and scale those evocations onto artifacts? Or is this mainly a thing about "ask your DM if so-and-so is possible for one artifact"?