The servants of the Adeptus Mechanicus believe that Themiskon Point once harboured a rich and diverse ecosystem, for the substrata of its surface are rich in organic fuels. For eons, Themiskon Point must have been host to planet-wide forests, yet today, no trace of life remains on the planet.
As far as most records indicate, this has been the case since the earliest days of the Imperium's presence in the Jericho Reach, though a few scattered writings suggest that the transformation to its present state took place at around the time of the Great Crusade.
Other crumbling archives suggest that the world was host to an advanced alien civilisation which destroyed itself in the face of Human conquest, submitting to the fires of planetary devastation rather than allowing a single Human to set foot upon their world.
A mystery at least as great as the world's past is to be found in its present, for the world has come under the dominion of a host of Tyranid vanguard organisms. Countless Lictors stalk the bleak, cratered surface, as if seeking a prey they know must surely exist but they cannot locate.
Several theories have been put forward to explain this phenomenon, including the notion that some trace of the original masters of Themiskon Point might still exist, perhaps waiting out the millennia far below the surface of their world until the day when Mankind recedes and they can reclaim and reseed their once paradisiacal world.
The forces of the Imperium rarely have cause to enter the inner reaches of the Themiskon System, for although it lies at the terminus of a well established stable Warp conduit, there are no worlds of any importance to the Imperium beyond it.
To date, the Imperium has yet to commit to cleansing the world of the Tyranid presence, but the Watch Fortress Erioch's Chamber of Vigilance has debated the matter on three separate occasions and a Deathwatch reconnaissance mission is likely to be launched in the near future.
- Deathwatch: The Achilus Assault (RPG), pg. 109