It runs the Pterodactyl Panel on a machine with 2vCPUS, 12GB of RAM and 100GB of storage. I've used it to run Minecraft servers, as well as other strange servers and programs through its own Docker container. I say that, but I actually have no idea how Docker actually works. I'll figure it out one day.
It's not an essential part, nor is it difficult, but I always like having subdomains. Especially for games like Minecraft, nobody is going to memorise an IP address. Most of the servers I run now will look something like this:
elysian.starinaphelion.com (Rimworld Together)
I have to admit, I don't always pick the easiest words. Oops.