About Sledgehammer
From ModrinthSmashes the stupid out of the client & server
Sledgehammer utilises SpongePowered/Mixin to patch issues in Minecraft and Forge mods
Features
- Configurable
- Compatible with Forge, SpongeForge, and SpongeVanilla
Client Patches
- Fix BluSunrize/ImmersiveEngineering#3474
- Disable SearchTree reloading (Speeds up server connection process)
- Increase the maximum length for a WorldType name in SPacketJoinGame
Common Patches
- Prevent crashes due to invalid translation keys
- Make LazyLoad Thread-safe (Should fix MC-68381
- Server Patches
- Print a single message instead of a stacktrace for advancement errors
- Don't reload Advancements on World Load (Fixes Achievement issues on SkyFactory 4)
- Fix NullPointerException in BiomeProvider::findBiomePosition
- Prevent Grass turning into Dirt
- Prevent Ice turning into Water
- Prevent Totemic from changing the weather
- Chunk Saving
- Alert players when a chunk fails to save
- Remove all Entities and TileEntities from chunks that fail to save
- Remove all blacklisted items from chunks that fail to save
- Generate a crash report and safely stops the server if a chunk fails to save
- Reduce Network usage by postponing flush
- Fix SpongePowered/SpongeCommon#2013
- Redirect inventory debugging messages added by Sponge
- Fix MC-134716 - Player kick exploit
- Prevent or delete any items that attempt to teleport across dimensions
- Limit books to 50 pages with 255 characters for each
- Fix potential deadlock on shutdown
- Prevent ConcurrentModificationException in PlayerChunkMap
- Fix Item spawn packet exploit with ProjectRed
- Fix P3pp3rF1y/Reliquary#370
- Redirect Ruins debugging messages
- Fix Daveyx0/PrimitiveMobs#59 (Sponge only)
- Force permission check for OP based commands (Sponge only)
- Fix Misty World portal issues (Sponge only)
- Fix An-Sar/PrimalCore#210 (Fixed in 0.6.56 according to Dev) (Sponge only)
- Prevent movement outside of the world border (Sponge only)
- Prevent sending blank death messages (Sponge only)
Dependencies
The jar containing '-sponge' does not contain these dependencies as they are already present in a Sponge environment.
Highlights
From source dataGame versions
Built for Minecraft 1.12.2.
Loaders
Runs on Forge and Sponge.
Footprint
Rated a light load on a server.
What kind of mod it is
From the catalogGameplay & overhauls
New mechanics, content and overhauls that change how the game plays.
Works on a server
From source side supportModrinth lists server-side support for Sledgehammer as optional: it can run on a server, but isn’t required there.
Compatibility
- Game
- Minecraft
- Loaders
- ForgeSponge
- Runs on
- Serveroptional on the server
- Game versions
- 1.12.2
Verified at the source
- ✓ModrinthOfficial listing, checked 2026-10-01Open ↗
- ✓AuthorLXGaming, as published on Modrinth
- ✓LicenseApache-2.0Free









