Black Amazon of Mars by Leigh Brackett, Science Fiction, Adventure in Bloomington, MN

Grimly Eric John Stark slogged toward that ancient Martian city -- with every step he cursed the talisman of Ban Cruach that flamed in his blood-stained belt.
Behind him screamed the hordes of Ciaran, hungering for that magic jewel -- ahead lay the dread abode of the Ice Creatures -- at his side stalked the whispering specter of Ban Cruach, urging him on to a battle Stark knew he must lose!