Aftergate

Two alien black obsidian pyramids sat on a ringworld deep in unknown space in the centre of a human city. With a large obsidian circle between them. Five hundred years ago, it was a gate that connected Mars and Earth, but it has since fallen silent. On the eve of Princess Alina's wedding, she will find that the ringworld is home to more than just humanity. Will she be able to uncover the secrets hidden within the ringworld's wall that holds the key to saving humanity and maybe even a way to reactivate the ancient gates?