MobRepellent allows players to construct "repellers" that will prevent hostile mobs from spawning within a certain distance. This is useful for cities and other settlements where mass amounts of torches are not aesthetically pleasing and cannot guarantee that mobs won't spawn.
Download v0.7.2 for CB-1.2.3-R0.2 - Source (github)
Download the sample config.yml file (place it in your plugins/MobRepellent directory)
Simply drag the MobRepellent plugin .jar file into your Bukkit /plugins directory. MobRepellent will automatically create all the necessary files.
Once the plugin is loaded, to create a repeller you'll need 7 iron, gold, or diamond blocks. First, using five blocks, construct a shape that looks like a plus sign (+) parallel with the ground. Next, place the remaining two blocks directly above the block in the center of the plus sign. See these:
How to Construct the Base

Completed Structure

After the repeller is constructed, no hostile mobs will spawn within a cuboid radius of the base of the repeller. For instance, if the radius is 50 blocks, it will repel in a 100x100x100 cube centered at the base of the repeller. Neutral mobs are not blocked by default, but this can be configured in the config.yml. MobRepellent does not affect mob spawners, hostile nor passive. To remove the repeller, simply remove one of the blocks that is part of the repeller.
Default repeller types and radii:
All console commands default to OP-only.
/mrlist - Lists all currently loaded repellers
/mrreload - Reloads the configuration file
/mrremove [repellerNumber] - Removes the selected number
as found in the list given by /mrlist. Does
not remove the repeller structure.
/mrremoveall - Removes all currently loaded repellers. Does
not remove the repeller structure.
MobRepellent now contains support for Bukkit permissions. Using a plugin such as PermissionsBukkit will allow you to take full advantage of the new functionality.
mobrepellent.* - Access to all permissions
mobrepellent.list
Default: OP-only
Allows use of /mrlist command
mobrepellent.reload
Default: OP-only
Allows use of /mrreload command
mobrepellent.remove
Default: OP-only
Allows use of /mrremove command
mobrepellent.removeall
Default: OP-only
Allows use of /mrremoveall command
mobrepellent.create
Default: all players
Allows player to create a repeller
mobrepellent.destroy
Default: all players
Allows player to destroy a repeller
You can configure MobRepellent to use almost any block type instead of the default blocks. You can also configure MobRepellent to use any radius to repel mobs, and select which mobs to repel and which to ignore.. On the first run of the plugin, MobRepellent will automatically create a config.yml file with the default values. See this sample config.yml file for more information.
Version 0.7.2
Version 0.7.1
Version 0.7.0
For previous versions, see the README file.
Notify me of any bugs or suggestions you have. I'd like to make this as useful as possible.