However, when Shandril arrived in Zhentil Keep intent on destroying the Zhentarim for killing her friends, aided by Mirt and some Harper agents in disguise, it was revealed that Sarhthor was a Harper agent sent to infiltrate the Zhentarim a long time before. By then, however, nobody knew where Sarhthor's true loyalty lay. At first, he appears to want to use Shandril to dominate the Zhentarim. But at last, as Fzoul Chembryl threw a javelin at Shandril, Sarhthor protected her with his body. Before he died, he told Shandril how to use the Crown of Fire.