Larry Niven Wiki
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Kobold was a tiny artificial world created in the outer Sol System by Jack Brennan, a human protector, composed of a small sphere of neutronium in the center ringed by a larger toroid structure. Gravity generators facilitated movement between the two sections and were used in games and art. Brennan destroyed Kobold just prior to leaving for his war with the Pak fleet so as to eliminate any evidence of his complex activity.[1]

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