It was previously adapted for comics by Roy Thomas, John Buscema, and Alfredo Alcala in Savage Sword of Conan #15.
The solicitation for the issue reads:
"Conan the Slayer #12
Writer: Cullen Bunn Artist: Dheerja Verma Colorist: Michael Atiyeh Cover Artist: Phroilan Gardner
Jehungir Agha's plan to ambush Conan in the dead city of Xapur goes awry when his[...]