Falon's Lament - Environment: By most Human standards, Falon's Lament is a beautiful and bounteous world. Its climate is largely temperate, its weather mild, and its growing seasons are much longer than its mild winters.The planet's native fauna is largely non-threatening. Preliminary tests have also shown that few of the native plants are capable of effectively competing against terrestrial strains. This combination suggests that the world should be ideal for Human colonisation -- and also relatively easy prey for a Tyranid assault.Of course, even these relatively mild conditions might seem overwhelming for those who are unfamiliar with life in an unforgiving environment. This factor certainly contributed to the collapse of several of the colonisation efforts. However, the planet's harsher seasons are exacerbated by the way that its water supply is organised.There are no major oceans upon the world's surface and only a limited number of significant rivers. Most of the fresh water on Falon's Lament is concentrated along those rivers and their estuaries. These provide areas that are most fertile for agriculture.However, those same regions naturally have some of the densest concentrations of native life. Before these regions can be properly settled, they must be thoroughly cleared. The portions of the planet's surface that are less congested with native life only have adequate access to water during the world's rainy seasons -- about half of its local year.For the remainder of the year, there is no ground water and only limited access to well water. This dry period often begins abruptly and can be brutal to those who are not adequately prepared for it.Because of this cyclic nature to the world's water supply, many of its native life forms are migratory. These include vast flocks of flying herbivores, as well as a few ground-based predator species that stalk the airborne prey as they feed. Perhaps the greatest threat among these is one known as the Stobrox.It most resembles a 20 kilogram cat with extended ears and powerful hind limbs, which grant it a vertical leap of more than 3 metres. A few of the surviving colonial reports indicate that these specimens may attack Humans, but only when cornered.Since 811.M41, two additional significant threats have factored into the world's ecology. When the Tyranid invasion began, the entire ecology of their xenos threats emerged. These included the broad range of hostile bioforms characteristic of Hive Fleet Dagon in addition to the structural elements including spore chimneys and capillary towers.However, for reasons that remain unclear, none of these have been able to garner a consistent foothold. The massive structures that characterise a Tyranid attack are either absent or much smaller than normally observed.Without these structures to breed new specimens, the vast majority of the attacking bioforms arrive via Mycetic Spore rather than breeding upon the surface. As the hive fleet has begun to deplete its resources, the ongoing invasion has faltered.At the same time as the Tyranids launched their attacks, the world's hidden defences became active. Analysts suggest that these likely emerged from deep beneath the planet's crust. These devices -- clearly of xenos origin -- extend in linear fashion from pole to pole.Massive weapons batteries have slowed the Tyranid assault and could be working to substantially restrict the incursion. Additional analyses have suggested that related subterranean structures might be responsible for the failure of the hive fleet's capillary towers and brood nests.Based upon their structure, armament, and unexpected appearance, Deathwatch analysts believe that these defences are of Necron origin. However, there has been limited evidence to confirm this. There are no confirmed sightings of Necron Warriors or other more sophisticated specimens.A few sightings have been recorded which are suggestive of Necron Scarabs. These reports are purely verbal but did come from respected Space Marines of the Deathwatch, so are likely accurate. If so, it is simply a matter of time before additional Necron forces appear.