Collapsing Cosmos : The Silver Key

In the eighteenth century, an occultist named William Carter discovers gateways to other places in time and space. Reality starts collapsing around him, slowly melting into nameless cosmic horrors. As he tries to understand his visions and find a way to stop them, he will see that he is not the first to make that journey, and that those who came before him brought back to Earth demented things that would have been better left alone.