Can Elminster break the rule of not using 10th level spells since he’s a favourite of Mystra?
Like if he needs to win against archdevil on the material plane or create a legendary artifact? No, but he wouldn't need to. As a Weavemaster, he can harness the energies of the Weave to power/charge any spells he could cast, beyond what energies the 'normal' castings would call up.#Realmslore
— Ed Greenwood (@TheEdVerse) April 17, 2020