I don't know what does the special feature "Stealth" and "Tombstone", so if anyone would like to help then I would appreciate it very much ~The_Walrus_8
Stealth allows you to disguise as mobs also make objects like hats. Tombstone puts all of your items in a chest when you die.
Stealth makes you turn into a mob, tombstone occasionally protects your items. Tombstone really depends on how the plugin is feeling that day.