Elexir might be a nice language, but you could probably also implement the server using socat... That said, scaling to tens of thousands of concurrent players i

Elexir might be a nice language, but you could probably also implement the server using socat... That said, scaling to tens of thousands of concurrent players is like the holy grail, especially if you want to shoot stuff and there need to be hit detection, and safe from client modifications/hacks.