Crown SMP is a new Java server for 1.21.8+ and it is trying to mix chill survival with real PvP when you want it.
In the survival world you can toggle PvP so you get to choose if you want fights. There is also a separate PvP world where combat is forced so if you want danger you can go there for risk vs reward.
Survival is claim based so you can protect your builds with land claims. If land is not claimed then it is fair game so you have to be smart and claim to stay safe.
The server has a massive quest system with over 10000 quests so you can explore grind and progress at your own pace. It also has jobs with leveling and prestiges so you can earn money from stuff like mining farming and building.
The economy is meant to stay balanced with player chest shops and trading plus server shops that are tuned carefully. There are extra features like a mob arena custom enchants and redstone powered flight that uses fuel plus cosmetic focused rewards.
