[@Dealdric] Wait, so what even is the spell then? Is it in effect whether he signs it or not.

If it is indeed in the form of the contract, I feel that it should be inextricably tied to the magic. Like if Anu's curse jar were to break, Ferron can no longer store curses simply because the 'container is broken but the spell remains'. Either way, he's probably not going to destroy it, but I feel that magical contracts in any form should be within Gammaton's jurisdiction. Such as how the GM ruled that Ragnagedon's destruction trumped Dirka's destruction magic. Multi-use tool, but not as potent.