Sayall is a dark, presumably tidally locked planet with a deep purple light. While the biome isn't easily determined chances are it is a tropical planet.
The planets terrain is not easily recognized due to its heavy amount of flora. Terrain seems hilly and can be mountainous in places.
Sayall is covered by vast amounts of flora including tall purple conical tree-like plants, purple mushroom-like plants that look similar to the silicon plant, and reddish tentacle/coral-like plants.
Bio-luminescent flying bugs along with some quadrupedal mammals seem to be the only natural fauna on Sayall. Sentinels are present, though it is not sure in what quantities.