Sagacity - Planetary Environment: Ancient records indicate that Sagacity was once a bountiful and lush paradise. Her forests and seas were vast and teemed with life. The soil was rich and well suited to Humanity's preferred agricultural crops. The temperature range and atmosphere were ideal over much of the world's surface, so that Humans could enjoy the beauty of the planet's natural environment.The completion of the first hive city began to reduce the world's natural splendour. As additional hives were completed, the planet's population increased as did its level of environmental pollution. Over the centuries, the world's atmosphere, soil, and waters all turned from benign to toxic. Much of the planet's native flora and fauna underwent severe mutations and a great deal of it died off.However, that environmental damage was trivial compared to the devastation wrought by the planetary collision. In an instant, the seas boiled, the atmosphere exploded, and the plates that underplayed the continents were shattered.Even though this event took place Terran millennia ago, Sagacity's atmosphere has yet to fully recover from the sudden influx of pollutants. Most of the wildlife that had survived the pollutants introduced by the hive cities were unable to cope with the sudden new changes.During the centuries of darkness, almost the entire native flora of the world died out. Without plants to replenish the world's oxygen and aid in the filtration of its pollutants, the atmosphere soon became even more toxic.Over the millennia, little has changed. Sagacity's natural environs remain inhospitable to any Humans that attempt to venture across it without some protection. Most of the surviving Human mutants rely upon filtration systems or rebreathers -- some of which have been passed down through generations for millennia.At ground level, visibility rarely extends beyond twenty metres. Fungal scrub life and toxic swamp waters filled with aggressive, mutated animals represent the majority of Sagacity's living threats.Few actual plants remain on the planet. Instead, a broad variety of different fungal life forms have emerged to fill that ecological niche. Some of these are even capable of sustaining the atmosphere, producing oxygen through a variety of biochemical reactions that draw their energy from sources other than sunlight.These include organisms that rely upon heat and unusual chemical sources. However, none of these processes are anywhere near as efficient as those of photosynthetic plants. As a consequence, the restoration has proceeded extremely slowly.The Necron presence has done little to aid this process. Their approach to most of the world's life has been a systematic pattern of slash and burn. The biological consequences of a toxic atmosphere hold little meaning to these undying, cybernetic xenos.However, they realise that the long term ramifications are extremely damaging to all of the planet's biological population. The Necrons of Sagacity hold all such life forms in disdain. They consider the destruction to be a worthwhile pursuit and have committed significant resources to its completion.As these xenos have continued their own reconstruction, the darkened skies have been a boon to their efforts. The thick cloud cover is impenetrable by visible life and resistant to most types of scans. Consequently, the Necrons have been free of the intrusions of most prying eyes.This has enabled them to devote all of their resources to the reconstruction of their shattered tombs without having to commit a significant portion of their forces towards defensive measures.With this in mind, they have often chosen to take measures that keep the atmospheric pollution in place until such time as they are prepared to commit their forces in their battles against the galaxy's other life forms.