More like Operation Incubus

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Operation ChaosSeries
series7 books1956
completed
Fantasy.
“Assembled from stories written across the 1950s and 60s, Operation Chaos was followed decades later by the direct sequel Operation Luna.”
from the catalogue
Start with Operation Chaos →
Darker Than You ThinkNovel
Jack Williamsonstandalone novel1948
Horror, dark in tone, about shapeshifters, set in north america.
RoadmarksNovel
Roger Zelaznystandalone novel1979
Time travel and science fiction, about dragons.
Witch WorldUniverse
universe106 books1963
Fantasy, set in secondary world.
“Step through the Siege Perilous — the standing stone that answers only the hunted, those with nowhere left to run — and the fugitive is delivered not into death but into another world entirely.”
from the catalogue
Start with Witch World →
includes Estcarp, Witch World Stories, Witch World Secrets, High Hallack, Witch World Chronicles, Witch World: The Turning
The Book of PtathNovel
A. E. van Vogtstandalone novel1947
Science fiction, about gods and survival, set in far future.
“Ptath, a very powerful god, is throwing by his deadly rival, the goddess Ineznia, on Earth, around 200,000,000 AD, in the form of a mortal, where he has to face numerous dangers to survive.”
from the catalogue
The HollowsSeries
series39 books2004
Urban fantasy, set in contemporary and north america.
Start with Of Vampires—Living and Not So Living →