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You should probably start by looking at the additional content syntax on MPMB's github. I know there's already a script on there for the Warmage from Valda's Spire of Secrets and one of it's subclasses, as well as three spells from the book, so that would probably be worth taking a look at too. As it happens I'm also actually working on a script commission for someone at the moment that adds in the House of Knights Warmage and a handful of spells from Valda's Spire of Secrets.