The Mercurian Pyramid

The Pyramid' is the name used to a massive alien vessel holding position above the Caloris Basin on Mercury. Like its counterparts, this vessel is to be part of the aforementioned fleet that attacked the Sol System during the Collapse, and which is affiliated (or synonymous) with the Darkness. From the vessel's current position, it blots out the Sun and shrouds the Fields of Glass in its shadow.