FloodedWorld replaces the Air with Water on the world chunks when loaded, wich makes the world flooded.

The spawn checks for the first water block after Y level: 60, wich prevents players from spawning at Y level of 250 or higher.

integrated /nv//nightvision command to get night vision effect.

WARNING: the server may crash after entering the Nether for the first time, trough chunk overloading. restarting and rejoin the server or and reduce the "Simulation-distance" & "view-distance" in your's server server.properties file, may fix this.