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Grief Prevention

Anti-Griefing Tools Login to Add Favorites
  • Minecraft
  • 10,717 Monthly Downloads
  • Supports: 1.8.1
  • 273,005 Total Downloads
  • Updated 01/31/2015
  • Created 12/14/2011
  • 54 Favorites
  • Project Site
  • Release Type: Mature
  • License: GNU General Public License version 3 (GPLv3)
  • Newest File: 10.6
Support development! **

About Grief Prevention

AUTOMATICALLY PREVENTS ALL FORMS OF GRIEF, including build/break, theft, spam, fire, spawn camping, lava and more, so you don't have to undo any damage after the fact. No configuration or database required! Stop responding to grief and prevent it instead. Grief Prevention will solve your grief problems without requiring you to manage a roster of trained administrators, juggle 10 different anti-grief plugins, take away cool standard game features, publish a training manual / tutorial for players, or add explanatory signs to your world. You can also choose to integrate PvP elements into build design to finally get a PvP experience befitting a sandbox game about creativity.

Grief Prevention stops grief before it starts automatically without any effort from administrators, and with very little (self service) effort from players. Solve all your grief problems with a single download, no database, and no configuration step.

Official Servers (Try it for yourself!)

You can experience this plugin for yourself (as a player) by joining any of these public servers. :) We maintain these servers personally, which helps us catch bugs and spot opportunities for new features and improvements. Have fun!

Downloads by Minecraft Version

Please choose the version that matches your Minecraft server version! :)

Feature List

Yes, everything is customizable. See Setup and Configuration.

  • No database or world backups required.
  • Extremely efficient CPU / RAM usage.
  • Land claims are easy to manage.
    • New players get automatic claims around their first chests.
    • Players who ask for help in chat get an instant link to a demonstration video.
    • Resizing claims and creating new claims is done with ONLY the mouse, no slash commands.
    • When a player appears to be building something nice outside his claim, he's warned and shown his claim boundaries.
    • Claim boundaries are easy to see, and don't require any client-side mod installation.
    • Extremely easy-to-remember, single-parameter slash commands for giving other players permissions.
    • Claim subdivision and granular permissions are available to organize towns and cities. Watch this video.
  • It's IMPOSSIBLE to grief a land claim. Watch this video.
    • No building or breaking.
    • No stealing from ANY containers.
    • No sleeping in beds.
    • No button/lever usage.
    • No adjusting redstone repeaters.
    • No pushing blocks in with pistons.
    • No pulling blocks out with pistons.
    • No TNT damage.
    • No creeper damage.
    • No damage from TNT cannons.
    • No explosive damage from other plugins, like Extra Hard Mode or Magic Spells.
    • No enderman block changes.
    • All doors may be automatically locked (optional, see config file).
    • No killing or luring animals away.
    • No stealing water (e.g. buckets).
    • No trampling crops, by players, animals, or monsters.
    • No building overtop, all claims reach to the max build height.
    • No placing or breaking paintings / item frames.
    • Fluids will not flow into a claim from outside.
    • No placing blocks via TNT/Sand/Gravel cannon.
    • No placing portals without build permission (even by walking through a portal in another world).
  • Pets and death loot are protected.
    • Players can't pick up what another player dropped on death without permission.
    • All types of pets are protected everywhere, even outside of land claims (can be configured per-world).
  • Excellent anti-spam protection
    • Warns, then mutes, then may kick or ban spammers (configurable - you choose).
    • Most spammers get only one message out before they're muted.
    • Blocks server advertising (IP addresses).
    • Blocks repeat message spam.
    • Blocks ASCII art (ex. Nyan Cats) spam.
    • Blocks similar message spam.
    • Blocks unreadable (gibberish) message spam.
    • Blocks CAPS.
    • Blocks macro spam (very different messages in quick succession).
    • Blocks login/logout spam, even when the spammer has multiple accounts.
    • Blocks death spam.
    • Blocks bot team spam.
    • Blocks slash command spam, including /tell, /emote, and any more you add.
  • Wilderness Protection and Rollback
    • Fire doesn't spread or destroy blocks.
    • Creepers and other explosions don't destroy blocks above sea level.
    • TNT doesn't destroy blocks above sea level.
    • No planting trees on platforms in the sky ("tree grief").
    • Instant, point and click nature restoration for not-claimed areas. Watch this video.
      • Insanely easy and fast fixes for penises, swastikas, and anything else unsightly.
      • Point at what you don't like and click, and it's fixed. Even from far away.
      • Never accidentally changes blocks inside land claims.
      • No need to investigate who built it, who broke it, or when they did it.
      • Doesn't matter if the griefer built with "natural" blocks, it will still be fixed.
      • No database.
      • No backups.
      • No chunk regeneration (it's dangerous for technical reasons).
      • Fixes bad chunk generations, like floating islands. It will be better than new.
      • Fills holes, even next to water to correct big spills.
      • Smooths noisy terrain.
      • No griefer construction is safe. If it's unnatural enough to be noticeable by players, it will be removed or filled-in.
  • Land claims can't be used as a griefing tool.
    • It's impossible to get a player "stuck" inside a land claim.
    • Land claims beyond the first require a golden shovel.
    • Minimum claim size prevents sprinkling small claims to annoy other players.
    • Max claim allowance grows with time played on the server, and can't be cheated by idling.
    • A simple administrative slash command will instantly remove all of a griefer's claims, no matter where they are.
  • Catches clever griefers.
    • Enhances the /ban command to ban ALL a griefer's accounts (not just his IP address).
    • Logs sign placements.
    • /SoftMute command to shut down chat trolls without them knowing they're beaten.
  • PvP Protections.
    • When PvP is off, no setting fire or dumping lava near other players.
    • Absolutely bullet-proof anti-spawn-camping protection including bed respawns, which requires no configuration.
    • No logging out, stashing items, or using plugin teleportation to escape combat.
    • Optional siege mode, to answer players who hide in their claimed houses to avoid combat.
  • Supports your server growth.
    • Permit players to exchange server currency for claim blocks (requires configuration and other plugins).
    • Grant claim blocks automatically for votes, donations, etc (console command provided, other plugins required).

The Manual

More Great Plugins!

  • Anti-XRay
    • Limits how quickly players can mine valuables, based on their play time / values mined ratio.
    • Keeps your valuables in the ground, so non-cheating players can find them (unlike ore loggers).
    • Practically free to run, unlike the tremendously expensive Orebfuscator.
    • Most legit players won't notice, but xrayers will ragequit and move on.
  • Population Density
    • Automatically assigns new players to wilderness where they'll find other new players and plenty of space, wood, and ore.
    • Optional teleportation system which can't be abused by players to escape combat or save them from being lost.
    • Login queue to guarantee fairness when the server is full.
    • Optional reserved spots for administrators.
    • Automatically removes idle players when the server is nearly full.

Project Status and Future

From BigScary: I've re-joined the project. Yes, I know many of you had a very bad experience with the beta builds, there were many bugs. We've rolled-back the buggy features which were added after I left the project, and then I continued the project from there as if I hadn't left in the first place. So far, I've added UUID support, greatly improved performance during play time and boot time, blocked new grief strategies made possible by changes to the game since I last worked on the project, cleaned up the config files, and tweaked several features for much improved player and administrator experiences. I've even added some new anti-grief features.

My current plan is to wait for a new mod platform to emerge ( is looking promising), then build a new grief prevention plugin for that new platform. Until then, I will continue working on this project as I always have. No other project I've ever worked on in my career as a software engineer compares to GriefPrevention's mix of fun, challenge, and importance to the community.

How to Upgrade to 8.0+ Builds

Starting with GriefPrevention 8.0.3, you can keep any claims and player data that was created by the broken "beta" builds. You just have to customize your config file again (a new config.yml will be generated in a folder named "GriefPreventionData").

Starting with GriefPrevention 8.1 which supports UUID (player name changes), GriefPrevention will do a one-time data update during boot. This can take a very long time - up to 1 second for each player who has ever played on your server. This is because GP has to contact Mojang via the interwebs to get the correct UUID for each player. At this time, it seems this process works well for offline mode and online mode servers, but there are mixed reviews for the hybrid "Bungee Cord" configuration (try it, but back-up first!). In any case, please back up before you take on this major update. If you have any problems, restore your data from backup, use the older version of GP which was working for you for now, and get your logs to me so I can investigate. :)

Coming Soon

These are my top priorities right now. It's not a complete list of everything I plan to do. :)

  • More performance tweaks.
  • Update /RestoreNature for new block types in 1.8.
  • Update /RestoreNature to handle water better.
  • Update /RestoreNature to regrow trees.
  • Fix killer bunnies not being damageable in other players' land claims (because Bukkit labels them "animals", not "monsters").
  • Add an abridged, easy-to-read chat log which auto-deletes its old data.
  • A /ignore command for players.
  • A /separate command to force two players to ignore each other.

Please Vote for Grief Prevention

I've just posted Grief Prevention on the Spigot site. If you love GP, please take a couple of minutes to give GP your rating and leave a short review. Better rating and positive reviews will help server owners who look for plugins on the Spigot site make the safe choice (GP) instead of downloading something sketchy or incomplete. :) Thanks so much for all your support!

Recent Major Changes

  • Nether portal protections disabled by default - Version 10.6 and higher. For sake of performance, the feature which prevents nether portals from being created in land claims without permission (by creating a nether portal at the corresponding coordinates in another dimension) is turned off by default. You can enable it in your config file. This "grief" is very difficult to execute, opportunities to attempt it are rare, and it's surprisingly expensive to prevent. Even when it works, the "victim" might actually be appreciative, since he didn't have a nether portal nearby already.
  • PvP worlds reset - Version 10.4 and higher. This area of the config file has been frustrating for many for a long time. I've rewritten it to be more readable, much easier to edit, and now you can have an empty PvP worlds list on a PvP server, if that's what you want. When you update to this version, you will have to customize this part of the config file again (if you ever customized it at all).
  • Finding offline players by name - Version 9.0 and higher. For sake of performance (not producing lag), players and admins can only target offline players who've recently logged in with Grief Prevention slash commands like /trust, /transferclaim, /claimslist, and so on. I plan to keep working on this to make all players targettable without causing a lag problem. This limit on who can be targetted is a temporary solution to work around a problem introduced by the CraftBukkit team when they made the switch to support player UUIDs.
  • UUID Conversion - Version 8.1 and higher. During boot, an often very slow, one-time conversion process will replace player names in your data with player UUIDs. This process can take as long as one second for each player who has EVER played on your server. Make a backup before you upgrade, and please be patient. If this process is interrupted, you'll have to restore from backup and start over. This change will ensure players who change their names will not lose claim blocks or access to their land claims. If there's a problem, I need to know whether you're online/offline/bungee, whether in database or flat file mode, I need your boot logs from the conversion attempt, and if possible, a snapshot of your data from before the update.
  • Disabled worlds in config - Version 8.5 and higher. If a world is "disabled" for land claims, then no land claims which already exist in that world (including administrative land claims) will be protected. For those upgrading from an earlier version ONLY, to ensure all existing land claims are protected, GP has defaulted worlds which were disabled to allow claims again, including player-made land claims. If this isn't what you want, update your config.yml.
  • Piston limiting - Version 8.1.7 and higher. Pistons won't move blocks outside of land claims. This is a huge performance win, but if you want the old rules back, there's a new config option to disable this rule. Yes, players do get an explanation/warning when they place pistons outside of land claims, to avoid confusion for newly-placed pistons.
  • /DeathBlow Removed - Version 9.3 and higher. It's no longer necessary, since the items players drop on death are now protected. This protection is on by default in non-PvP worlds, and off by default in PvP worlds. You may customize it in the config file. You can still use /kill to kill a player, although /kill will not send the player's inventory to another player as /deathblow did.

All Recent Changes

10.6 Updates

  • Hoppers will no longer pick up protected player item drops due to death, preventing lethal traps from stealing them.
  • For sake of performance, the feature which prevents nether portals from being created in land claims without permission (by creating a nether portal at the corresponding coordinates in another dimension) is turned off by default. You can enable it in your config file. This "grief" is very difficult to execute, opportunities to attempt it are rare, and it's surprisingly expensive to prevent.
  • Admins with both adminclaims and deleteclaims permissions may now resize another player's land claim to smaller than the minimum.
  • UUID migration is now a lot faster.

10.5.7 Updates

  • Made expanding chest claims a little easier for new players.
  • Fixed database connections going stale on some servers.
  • Fixed a UUID migration bug for database mode servers upgrading from very specific earlier versions.

10.5.6 Updates

  • Fixed rabbit theft using jump splash potions and carrot bait.
  • Now GP knows about the WorldGuard override permissions, which makes the WorldGuard compat feature work more smoothly for admins.
  • Claims expand down faster now when you build underneath one you're allowed to build in.
  • Removed the "claim creation requires permission" option. Now it's always on, and all players have permission by default. You can use a permissions plugin to take away custom land claim privileges for specific players or all players.
  • Might have worked-around the mcMMO bug which allows players to inflict "bleed" effect on protected animals.

10.5.5 Updates

  • Fixed players trampling crops (broke it last version, my mistake!).
  • Performance boost for player interact event.

10.5.4 Updates

  • Fixed claims expiring too fast on new creative mode servers.
  • Fixed data migration rolling back claim blocks for some players with uppercase letters in their names.

10.5.3 Updates

  • Fixed a minor protection bug stemming from a Vanilla bug.
  • Fixed "someone" instead of player name for players in their first session on your server.
  • Fixed an admin chat message having an unclickable link in creative mode worlds.
  • Fixed a database migration bug.
  • Fixed a UUID migration bug.

10.5.2 Updates

  • When creatures tramping crops is allowed, player-controlled mounts will no longer damage crops.
  • When players log in, they have to move at least one block before they can chat (this is an anti-botting strategy). Players who've earned the trivial "got wood" achievement on your server are exempt from this rule.

10.5.1 Updates

  • Attacking a villager in a land claim now requires build trust, since villagers are potentially a major investment. Interaction (right click) is still container level trust.
  • Because item frames and armor stands are decorative, they're part of your build's aesthetic and now require build trust to destroy. Interaction (right click) is still container level trust.
  • Fixed visualizations showing at most one subclaim. Now they show them all again.
  • No more log spam about grass. This was a debug message related to sheep eating grass that I accidentally left in. :\
  • Added a 10-minute cooldown period for being warned about building outside of your land claims.
  • Greatly improved the performance of the "claim block delivery" task.

10.5 Updates

  • Interacting/trading with a villager now requires container trust (same as animals other inventory).
  • Inverting a daylight sensor (right click) now requires build permission.
  • /rnf now works better in grassy areas.
  • No more sign notifications for signs which contain only spaces.

10.4 Updates

  • Negative effect potions (weakness, poison, hunger, etc) now follow PvP immunity rules - they will not effect players in a no-PvP area except for the thrower, and will not effect ANY players if thrown from a no-PvP area.
  • The PvP rules worlds part of the config file has been RESET and redesigned. If you customized that part of the config file, you'll have to do it again using the new settings (sorry!). The new design is MUCH easier to understand and edit.
  • Added a config option to disable the WorldGuard compatibility feature.
  • API changes (for developers)
  • * Added datastore.getClaim(id).
  • * Added datastore.getClaims().
  • * Added ClaimDeletedEvent.

10.3 Updates

  • Admin claim visualization style updated to ask clients to do less lighting updates.
  • Nearby claim search now tells you how many claims were found.
  • When resizing a players' claim, his remaining claim block allowance is now shown instead of yours.
  • Fixed log spam when players walk into portals that don't go anywhere (e.g. end portals when the end world is disabled).
  • Made UUID migration more reliable.

10.2.1 Updates

  • The world guard compatibility feature to require WG build permission before a GP land claim can overlap a WG region is back with much better performance.
  • Claimed vehicles (e.g. minecarts) will now take environmental damage like lava, fire, and cactus. TNT and Creepers still won't damage them because griefers could potentially be in control if those damage sources.
  • Added some command aliases to make commands easier for players to remember and/or guess.
  • The "no lava buckets near players" rule now ignores creative mode players, and won't give away the nearby player's name (in case of invisibility).
  • Tweaked the IP address spam filter to be less aggressive.

10.2 Updates

  • Fixed the "claim blocks are scattered along the horizon" bug. Side effects: some CPU time savings and visualizations only make marks within 100 blocks of the player receiving the visualization.
  • Now wholly preventing nether portals from being created without a claim owner's permission, instead of redirecting them to an unclaimed area.
  • Improved performance for nether portal related code.
  • Probably fixed the rare but persistent "some of my players suddenly have negative claim blocks" problem.

10.1 Updates

  • Temporarily disabled new world guard compat feature until the WG staff/community can help me find a more efficient implementation.

10.0 Updates

  • Now preventing nether portal traps (found a workaround for the spigot bug blocking this feature).
  • Now preventing players from creating nether portals in a land claim by building a nether portal in another dimension and walking through it (those portals are now redirected so that they're built where the player does have permission).

9.9 Updates

  • Creating a land claim which overlaps a world guard region now requires the claim creator to have build permission in the world guard region.
  • Fix: Teleporting into a land claim using an ender pearl now requires access trust (you can disable this in the config file).
  • Fixed /acb [permission.node] not working for database mode servers.

9.8 Updates

  • Sand/gravel cannons won't place blocks in land claims anymore.
  • Fixed overly sensitive similar message filter and CAPS filter.
  • Fluids may now flow into subdivisions from the parent claim, but not vice-versa.

9.7 Updates

  • Fixed nether portal traps (needs a Spigot bug fix to start working).
  • Added a config option to limit total land claims per player.
  • Improved readability of /ClaimsList output.
  • Fixed claim visualizations missing some visualization blocks.
  • Made new player help harder to miss and easier to understand.
  • Made an effort to educate players about claim subdivision when they make very large claims.
  • Added /GPBlockInfo to help modded server owners edit the config file correctly.
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