CataclysmCraft 4 feels like a big modded adventure server with a ton of stuff to do. It runs on Minecraft 1.20.1 and uses a custom modpack so it is not just a basic survival world.
The owners even made their own original mod just for this server. It adds new monsters and a whole new dimension to explore so it feels different from normal Minecraft.
The world itself is also custom. They used world painter to make a massive map that is built for exploring and building kingdoms instead of a boring default seed.
There are a bunch of well known mods in the pack like Biomes O Plenty Epic Knights Tinkers Construct Via Romana and Alexs Mobs plus the main Cataclysmcraft mod. So the gameplay feels like a mix of exploration fighting building and tech.
You can build your own kingdom and still be safe because the server has land claiming. PvP is allowed but they also use a corpse mod so when you die you do not instantly lose everything which makes it less stressful.
Overall it looks like a modded server for people who like adventure new monsters custom worlds and building big bases while still having some danger from PvP and the world itself.

