That all said, I disagree with the idea that learning more BM would reduce Mathilde's inclanations towards swordswomanship. There are many mages who can rain down fire and destruction from afar, but assassinating enemy leaders and other super-combatants is something Mathilde is uniquely suited for. Between her unique sword and her arsenal of Mastered spells, she's far better at doing so than most, if not all, of her fellow Grey Lord Magisters. Heck, if there'd be one BM that would suit her best, rather than the Pit of Shades or The Penumbral Pendulum I'd say it would be a spell to teleport an entire army unit for a surprise attack. Too bad it's a Storm of Magic exclusive spell, IIRC. (Ah, sorry I couldn't find or recall its name.)