Frostworld and Dreamfire by John Morressy
Popular Library, 1977
Price I paid: 50¢
Since the beginning of time, the Onhla tribe had flourished amid the dramatic extremes of heat and cold on the planet Hraggellon. But now the race was on the verge of extinction.
Within its ranks, a mysterious, murderous malady was running wild. Meanwhile, from another galaxy, the spearhead of an all-conquering empire had made its initial penetration.
Only one hope remained. A youth name [sic] Hult, newly emerged into humanoid form after his animal childhood, and beginning a desperate, daring quest for the elusive key to survival that would take him to the most perilous regions of his world―across the unknown reaches of outer space―and into the most secret and startling depths of himself….