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'''Igneous Cavern''' is the largest human-inhabited cavern on [[Detritus]]. It is home to the manufacturer that produce the [[DDF]] ships.{{book ref|Skyward|prologue}} In addition, it houses reserve ships for the DDF in event of an emergency such as a [[Lifebuster]].
Glorious Rises of Industry is a suburb in Igneous. It is wear Spensa, her mother, and Gran-Gran live.{{book ref|sky1|1}}
It is also the home of [[Spensa]] and [[Rig]].
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