Since people are wondering how to make a staff only realm I decided to make this guide.
1. Open your world config arcemuworld.conf or whatever
2. find <Server PlayerLimit = "100" (may be different depending on your server)
3. Change <Server PlayerLimit = "100" to <Server PlayerLimit = "0" this will make it so no one that doesnt have gm power not able to enter the realm, if player has anything besides 0 as permissons like y (it has no commands) it will allow a player to join.
4. Restart the realm and it may need a logon restart not sure.
Enjoy
(I hope this isn't a repost i didn't found this guid anywere so please dont flame if its a repost)