This setting makes the whole level reseted at game end. This means that all block placed/broken will be reverted to their original state. To detect what is a level or not the plugin catch where players goes and save chunk arounds. Only players playing Tribu are considered. This means 2 things : every player not playing Tribu can break a part of the level if this part was not visited by a Tribu player, if a non-Tribu player want to build something next to a level, this will be reverted. This feature can makes your server lag a bit but should not freeze your server unless you have a really low-resource server.
Players.AllowBreak and Players.AllowPlace
These 2 settings allow or deny players to place or break blocks. The permission "tribu.super.place" and "tribu.super.break" overwrite these 2 settings. If a player try to place a block with "AllowPlace: false" this will be cancelled but if he has "tribu.super.place" this will works
Level.Jail and Level.JailRadius
The jail prevent players to leave the death spawn after being killed. You can choose a radius around the death spawn where they can go.
The clear zone is a radius from initial spawn. It's mainly used to determine if a mob is inside a level or not, then if it's not a Tribu zombie he is removed. This setting is useless if you have set either WorldExclusive or ServerExclusive to true
This will be use if AllowPlace is set to false. If this permission is set to true for given player, then he'll be able to place blocks.
This will be use if AllowBreak is set to false. If this permission is set to true for given player, then he'll be able to break blocks.