Wave 1 - I put up blockades and 1 harpoon at each of 5 spots. add 2 harpoons at lower crystal and 1 at upper. Add additional harpoons and auras during subsequent waves. Add more harpoons if needed, and even remove ensnare at 2 central points to make room for more harpoons. If you do that, stay central and add ranged dps with weapons or pets.