The Disano Impact Site is a large impact crater left on the human-controlled planet, Mu. It is perfectly conical in shape (although centuries of erosion have somewhat overtaken this trait). The crater is hypothesized to have been created by the payload of an immensely powerful mass accelerator cannon, although there is little substantial evidence to back this up.
Roughly 2000 years before the human-taik war, Mu, then an uninhabited world, was unexpectedly struck by a basketball-sized boject (of unknown density) that had been travelling at extremely high speeds. The impact left the entire planet desolate in a resulting impact winter. Investigations after the fact revealed a perfectly conical impact crater that distributed debris into the air like an explosive shaped charge. The walls of the crater were smooth, as though cut with an extremely sharp and precise blade.
It was determined that the crater could not have formed naturally, and theories quickly rose over the nature and cause of the crater. Among the more popular suggestions is that the object that hit Mu was in fact fired from a mass accelerator cannon from outside The Vale. The baseball-sized projectile had been travelling at roughly 0.1% light speed (300,000 meters per second). Its trajectory was tracked, at it had indeed come from outside The Vale. However, even after entering The Vale, it was had still been travelling for upwards of 10,000 years before impacting Mu.
An enormous amount of debate among species has arisen over the nature of the Disano Impact Site, even 2200 years after its discovery. It is widely believed that the object that struck Mu was a weapon of some kind. One of the most popular speculations is that The Compositor was its intended target, and that Mu was simply in the wrong place at the wrong time.
With the discovery of the Second Compositor, it is not illogical to assume that several Compositors, and subsequently several Vales, exist.
Arguments against the "interstellar weapon" hypothesis point out the ludicrous impracticality of such a weapon. The object had been travelling for upwards of 10,000 years before impacting, and it had to travel through an area dense will planets and stars, among other celestial objects. Other arguments have suggested that the supposed "perfectly conical" crater was mere embellishment, often alluding to Saturn's "perfectly hexagonal storm" which, while six-sided, is far from perfect.