The Savage Sword of Conan #54

Conan crosses the desert on his way to Zamboula, chasing Isparana and the talisman known as the Eye of Erlik which she has stolen from Hisarr Zul. In an oasis, he is attacked by two robbers and kills them. Shortly thereafter, Conan meets the Turanian soldier Arsil and his men and learns that they are searching for the robbers he just killed. He is told of a shortcut through the mountains, guarded by a sand demon who turns out to be Hisarr Zul's brother Tosya. He lets Conan go, provided that he kills Hisarr Zul.