Viridiel turned and cast a shield up around Merenwen in the breather provided by the the fleeing deathknights.  As the ghouls charged him his eyes and body crackled with golden energy as he then began to unleash holy nova after holy nova.  Burning the ghouls and deathknights with holy energy even as he healed himself and Merenwen, but burned through his mana in the bargain.