In the change between Burning Wheel Revised and Burning Wheel Gold, casting spells no longer uses Sorcery + Will, and instead just uses Sorcery. Spellweaver was stripped out, which presents a problem when it comes to utilizing the Magic Burner properly.
By and large, the Magic Burner, a companion to BW Revised is compatible with BW Gold - however, as a result of the changed obstacles for sorcerous castings, Abstraction and Distillation is no longer compatible. The example they give from the Magic Burner is as follows:
I want to create a spell that sends a blast of leaves and dirt into my enemy's face, distracting him.
My leaf distracting spell would be Earth, Tax, Presence Origin, Instantaneous Duration, Single Target. ... It's an Ob 5 spell, and takes 12 actions.
(I've omitted the derivation because the book's text is not public.)
In Burning Wheel Revised, this would have been moderately difficult. Someone may have +4 Sorcery and +4 Will, giving them +8 for Ob 5. Not easy, but possible to accomplish - their average roll would be a 4.8.
However, in Burning Wheel Gold, they would just be rolling their +4 Sorcery for an Ob 5 casting, which borders on impossible, even when executed Patiently and Carefully - their average roll is a 2.4.
I'd like to include Abstraction and Distillation in my BWG games. However, it's very obvious that it's not directly compatible. I have no clue how to balance it, however.
Is there a way to do this without introducing serious imbalance issues?