Spelljammer
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Spelljammer is a campaign setting originally published for the Advanced Dungeons & Dragons role-playing game, which features a fantastic outer space environment. Subsequent editions have included Spel
Original Spelljammer boxed set (TSR, 1989)
Phlogiston theory
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The phlogiston theory, a superseded scientific theory, postulated the existence of a fire-like element dubbed phlogiston contained within combustible bodies and released during combustion. The name co
Spelljammer
…such as the Forgotten Realms). However, unlike Planescape, it keeps all of the action on the Prime Material Plane and uses the crystal spheres, and the "phlogiston" between them, to form natural barriers between otherwise incompatible settings. Though the cosmology is derived largely from the Ptolemaic system of…
The alchemist and physician J. J. Becher proposed the phlogiston theory.
Georg Ernst Stahl