The Castle Perilous series revolves around Castle Perilous (the name is drawn from the Siege Perilous of Arthurian fable), whose lord is Incarnadine, a sorcerer.
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Some of these dimensions are magical, while others have little or no magic; one of the latter is Earth.
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At this point Jake is accompanied only by his father, Sam, who is actually dead but has been "converted" into an artificial intelligence unit that is built into the truck.
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John DeChancie's Starrigger series uses vertically-aligned Tipler cylinders (officially called Kerr-Tipler objects) to create spacetime gateways along an intergalactic highway.