After shrieking out horribly, the Lich started retreating behind its troops, where it could cast spells safely. But Luna kept blocking its way, making it increasingly angry.
"I will make you into the most subservient undead I ever did, you foolish animal!" it shrieked out.
But Luna was unimpressed. Opening her mouth slightly, she conjured another Moonbeam, smaller but more concentrated, firing it at the Lich.
The Lich brought up another barrier, blocking the spell almost entirely, as only residual energy washed over him, slightly singeing his robe. The undead already knew that the giant stag's magic was of the opposite element to his, which meant it could badly hurt him.
But the same went for him, as well.