@DaveHiggins has got it!
I’d also make sure that you’ve got the Enchanting skill (BWG p260), of course!
Combined with Astrology, that really flavours what your enchantments look like.
We’ve also used a number of those complementary skills to better reflect what this or that Imbue looks like, and to get a feel of how the Enchantment is built.
If you’ve got the Burning Wheel Codex, then you can also have a look at p290-305 for more detailed information, but for your NPC, I don’t think you’d need to worry about it.