Alright, I'm playing a Twilight, and now I plan on learning necromancy, what is the limit of my potential learning? I already know Terrestrial, Celestial, and Solar circle sorcery.
(looks up the Thurible so he doesnt stick his foot in his mouth)
The Thurbile only allows one to cast Demon summoning spells at one level higher. If you wanted the whole Void Circle package, youre looking at an N/A artifact. One specific function (Walking war machine and its follow ons for example) would be within the realm of a necromantic Thurible though.