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It is, however, most notably featured as the planet where [[Commissar]] [[Ciaphas Cain]] along with the [[Valhallan 597th]] were deployed to defend a promethium refinery against marauding bands of [[Orks]]^1b, and later encountering [[Necrons]] released from stasis by the presence of sentient life^1c. It is was later revealed speculated that high-ranking [[Magos|Magi]] of the [[Adeptus Mechanicus magus, Ernulph]], had deliberately built the refinery exactly above the Necron Tomb , in order to investigate it.^1d

The [[Imperial Guard]], realizing that they could not defeat an endless wave of foes (noting their apparent indestructibility that said foes were apparently indestructible without the help of an [[Astartes]] [[Chapter]]) in addition to , on top of a wave of Orks in the company of being led by a [[Gargant; ]], promptly chose to evacuate the mining colonies to an awaiting ship, the [[''Pure of Heart]]''. ^1g

From there, they detonated the promethium-filled caverns with bombs placed by sappers originally meant for the approaching Gargant. The blast was so powerful that shockwaves were felt throughout the already -spaceborne ''Pure of Heart'', and left a kilometers-wide crater that permanently scarred the pristine icy-beauty of Simia Orichalcae.^1h

[[Ordo Xenos]] [[Inquisitor]] [[Amberley Vail]] later launched an investigation and, much to everybody's relief, found no evidence of any further necron Necron activity. She later stated ; although she privately admitted that she was none too keen to be the first to start digging holes to find out for sure¹ⁱ.