So, I picked up a stack of these Warlock books for $0.25 each at a local used book store (Zia Records on Thunderbird in Phoenix, AZ), mostly because they looked very Appendix-N-like, and because I needed some light reading. The series is goofier than I expected, but fun - the basic premise is that in a spacefaring future, a colony was founded on a distant world by a sort of SCA group that wanted to have a medieval society. The kinds of colonists who were attracted to this were mostly latest psionicists, and a few centuries of breeding from a population that self-selected (unknowingly!) for this trait in a medieval world bred "witches" and "warlocks" with uncanny "magical" powers (psi-powers). Worse, there is a native fungal life-form, which they dubbed "witch moss," which reacts to psi power by reshaping itself into other forms - the subconscious projections of a world of psi-wielders created fairies and monsters and such out of witch moss. So it is a complete fantasy world, a lost colony of humans in space . . . until Rod arrives on the planet. He represents a government agency tracking down lost colonies and trying to prevent them from being manipulated by shadowy enemy organizations. They - and he - realize that the concentrated psi-powers of this planet may be just what the democratic future of humanity in space needs - instant communications between worlds via telepathy! So Rod is safeguarding the world for humanity's future - but in the meantime, he needs to fit in, and uses his technology (including putting his ship's AI into a robotic horse body) disguised as an unknown form of magic to become the High Warlock. All is going well . . . until the island kingdom, the planet's only settlement, is attacked by Viking raiders from afar . . . who are Neanderthals?!?!? Something is very wrong here! And so it goes . . .