In mission 10, Kael is left by the Alliance, alone, surrounded by undead. It all may look helpless at first, but then Lady Vashj come to help. She is a naga ranged hero, who can cross water and ground. She has a lightning spell, weapon damage spell and shield spell. There is that pendant of vitality in the near camp, which can be bought a lot, and fill the inventory before the next mission. Lady Vashj warriors are almost unstoppable with proper support.