This made a huge difference. In fact, the first time I fought her with my new loadout, I depleted her health bar down to around 10 percent. Before that, I could hardly get it under 50 percent. It was clear that this was the right way to approach the fight. I just had to be more aggressive and keep the mistakes to a minimum. The plan was simple: Hit her with my runic attacks, survive during the cool down period, and repeat.