Obliterator

Mass Block Breaker — a Fabric mod for Minecraft 1.21.1 that lets you perform massive world-editing operations with a simple two-step confirmation system.

How it works: Break a block, kill an entity, or scoop a liquid once to see a count of all matching targets nearby. Perform the same action again within a few seconds to confirm and execute the operation. Every action can be fully undone.

Three core systems:

/massbreak — Block Operations

• Destroys every block of the same type within a configurable radius (up to 500)
• Chain Mode — Only destroys connected blocks (flood-fill vein mining)
• Replace Mode — Replaces broken blocks with another block instead of removing them
• Flatten Mode — Removes all blocks above a target Y-level and fills holes below with your chosen fill block
• Timelapse Mode — Dissolves blocks layer-by-layer outward from or inward toward the player, great for video recording
• Wave Mode — Breaks blocks in expanding rings with a configurable tick delay between rings
• Preview Mode — Highlights all affected blocks with glowing particles before you commit
• Configurable drops, processing speed, and max block limits

/masskill — Entity Operations

• Kills all entities of the same type within a configurable radius
• Safety Filters — Individually toggle protection for named entities, tamed pets, baby mobs, villagers, and other players
• Toggle loot drops and XP separately
• Full undo respawns exact copies with NBT data preserved

/massliquid — Liquid Operations

• Drains all water or lava within a configurable radius
• Triggered by using an empty bucket on a liquid source
• Source-Only Mode — Removes only source blocks; flowing liquid drains naturally
• All-Liquid Mode — Removes sources and flowing blocks together
• Also detects bucket fills (picking up liquid triggers the removal prompt)

Safety & controls:

• Built-in blacklists for blocks (bedrock, spawners, portal blocks, command blocks, jigsaw, etc.) and entities (ender dragon, wither, warden, iron golems)
• Configurable max operation size and blocks/entities processed per tick to prevent lag
• Confirmation timeout prevents accidental triggers
• Operator permission level 2 required by default (configurable)
• Undo history stores up to 10 operations per player per category