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{{Tsrwotc}}<small>''This article is about the celestial objects known as crystal spheres, if you are looking for the AD&D adventure module named after them , see [[SJA3 Crystal Spheres]].If you are looking for individual crystal spheres, see [[Canon:Spelljammer crystal spheres]]''.</small>
A '''crystal sphere''', also known as a '''crystal shell''', is an object of great size that surrounds an entire [[planetary system]] and forms a boundary that separates [[wildspace]] from [[phlogiston, the|the phlogiston]].<ref name="CoAS">{{Cite_Pub|AD&D Adventures in Space}} ''Concordance of Arcane Space''. pp. 9-10.</ref>
