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The '''Theta Cluster''' is an [[asteroid ]] cluster that housed research sanctums for the [[Adeptus Mechanicus]] located in the [[Torvald System]] in the [[Atroxia Subsector]], located in the [[Caligari Sector]] in the [[Segmentum Tempestus]].{{Fn|1}}

This asteroid cluster housed research sanctums for the [[Adeptus Mechanicus]], specialising in the testing of unique artifacts. When a strange [[Xenos]] item was transported to one of the laboratories for routine consecration, it turned out to be a relic of a former [[Imperial ]] [[Saint]], tainted by [[Chaos]]. The purification ritual ended in catastrophic failure, the fabric of [[Realspace]] was torn and the asteroids are still infested by creatures of [[Chaos]].