Campbell SMP is a long term adult survival server with a chill community. People have school and jobs so nobody expects you to be on all the time. It is made for players who want a place to come back to and keep working on stuff.
The server runs on 1.21.11 and it is set to Hard. It has a bunch of server side additions so you do not need to install anything. There is proximity chat and a Bluemap so you can see the world.
World gen is changed with Terralith and Tectonic. The Nether and End are upgraded with Incendium and Nullscape. There are lots of quality of life changes like timber armored elytra fishing expansion and invisible item frames. Many structures are overhauled too like trial chambers mansions temples ancient cities and ocean monuments.
The big twist is the skill leveling system. You level different parts of the game to unlock higher tier gear. It makes early game last longer but you can still level up fast if you want. They also run regular events with prizes and they are working on a shopping district and a nether hub.
