Coral is a free passion project being developed by fans of the Halo series to create a singleplayer/cooperative Campaign experience on PC, with the inclusion of Player v Enemy modes such as Firefight and Flood firefight, along with a Player v Player Multplayer mode.
It's only bleak skies for a Spartan like you, Seven.
Feel free to join our Discord Server (link on our page) to keep up to date with the project.