This is a lifesteal server called MinecraftOffline and it runs on version 1.21.11. The world is permanent so your builds and progress are not getting wiped all the time.
The server uses a custom plugin suite so it is not just plain vanilla and the lifesteal system makes PvP way more intense. The host is in Finland so it is really good for players in Europe because the ping stays low.
The hardware is pretty strong with an Intel XEON E 2276G processor two 960GB NVMe SSDs 64GB of DDR4 ECC RAM and a 1 Gbit network so the server should run smooth even with a lot of players.
There is also a community on Discord where players can hang out and talk about the server and plan stuff together.
