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Commers put around 'also known as a crystal shell'
''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]].''
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">[[AD%26D_Adventures_in_Space#Concordance_of_Arcane_Space|''Concordance of Arcane Space'']] pages 9-10</ref>
The size of crystal spheres is related to the size of the planetary system within them. As the name 'crystal sphere' implies, the objects are spherical.<ref name="CoAS">[[AD%26D_Adventures_in_Space#Concordance_of_Arcane_Space|''Concordance of Arcane Space'']] pages 9-10</ref>
