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Consisting of nine worlds which orbit around the angry star [[Sthenelus (Star)|Sthenelus]], most of the System is inimical to life and sparsely populated by elements of the Iron Hands or [[Adeptus Mechanicus]]. It is thought that a debris belt located between the orbits of [[Raeon]] and [[Thennos]] are the remains of an unnamed planet destroyed during the [[Age of Strife]] by unknown means. However, speculation by the [[Ordo Astra]] theorizes that the system may once have been the site of a clash between the [[Necron]]s and their [[Old Ones|ancient foes]]. This hypothesis goes on to say that that not only the dust belt, but possibly what are now the dead worlds of [[Thoosa]] and [[Graea]], are fragmented remains of prosperous planets destroyed in that conflict. While there still is no concrete proof for this theory, Medusan folklore might indicate a lingering Necron presence on Medusa itself as late as the Age of Strife.{{Fn|1}}

*[[Sthenelus (Star)|Sthenelus]] - — Sun.{{Fn|1}}*[[Thoosa]] - — [[Dead World]].{{Fn|1}}*[[Graea]] - — [[Dead World]].{{Fn|1}}*[[Medusa (Planet)|Medusa]] - — [[Adeptus Astartes Homeworld|Homeworld]] of the [[Iron Hands]].{{Fn|1}}*[[Skylla]] - — [[Mining World]].{{Fn|1}}*[[Ladon (Planet)|Ladon]] - — [[Gas Giant]].{{Fn|1}}*[[Hesperos]] - — [[Gas Giant]].{{Fn|1}}*[[Pindar]] - — [[Gas Giant]].{{Fn|1}}*[[Raeon]] - — [[Death World]].{{Fn|1}}*[[Thennos]] - — [[Adeptus Mechanicus]] Research World.{{Fn|1}}

{{triviaTrivia}}*The system may derive its name from [https://en.wikipedia.org/wiki/Stheno Stheno], one of the Gorgons of Ancient Greek mythology and sister of Medusa.