With the city of Dalaran under siege by their own constructs, this is the perfect opportunity to, let's say, borrow a few samples. Imagine an army of arcane-powered abominations. The Dark Lady would have no choice but to recognize my alchemical prowess. Maybe even grant me head of the Royal Apothecary Society? Go to the city and find the constructs' cores. They are unlikely to give them willingly, so do what you must.