Randomized Block & Mob Drops

How It Works

Load a world. RBMD automatically:

1. Scans all loot tables to find every naturally obtainable item
2. Shuffles them using your world seed
3. Writes a datapack and reloads — drops are active immediately

If you change your config or mod list, RBMD detects the change and rebuilds the datapack using the same seed on the next world load. No manual steps needed.

🔁 Want completely new drops? Run /rbmdreshuffle at any time.

Commands

| Command | Description |
|—|—|
| /rbmdhelp | Show help in-game |
| /rbmdreshuffle | Re-randomize with a new seed |
| /rbmdreshuffle <seed> | Re-randomize with a specific seed |
| /rbmdfind <item> | What block or mob drops this item |
| /rbmdmob <mob> | What this mob drops now |

Both /rbmdfind and /rbmdmob support tab completion — start typing minecraft: or mymod: and it will suggest matching items and mobs.

Debug commands (OP only)

| Command | Description |
|—|—|
| /rbmddebug | Force rebuild the datapack if drops seem wrong |
| /rbmdcheck | Verify blacklists are working — shows pool size and flags issues |
| /rbmddump | Export every drop change to datapacks/rbmd_randomizer/rbmd_dump.txt |

💡 Use /rbmddump to review all changes and copy IDs straight into the blacklist config.

Config

File: config/rbmd-common.toml

Changes are detected automatically on next world load — no need to run /rbmdreshuffle unless you want new drops entirely.

| Option | Default | Description |
|—|—|—|
| randomize_blocks | true | Randomize block drops |
| randomize_mobs | true | Randomize mob drops |
| randomize_silk_touch | true | Randomize Silk Touch drops |
| item_blacklist | (see below) | Items excluded from the pool entirely |
| mob_blacklist | (empty) | Mobs whose drops are never randomized |
| mod_blacklist | (empty) | Exclude all items and mobs from a mod by its mod ID |
| chaos_mode | false | Skip all filters — see below |
| reset_welcome_message | false | Show the welcome message again on next join |

Item blacklist defaults — excluded because they can’t be obtained naturally: bedrock, barrier, command_block, chain_command_block, repeating_command_block, structure_block, structure_void, jigsaw, light, debug_stick, knowledge_book, bundle. Remove any entry to put it back in the pool.

Blacklist format — use full registry IDs:

item_blacklist = ["minecraft:diamond", "mymod:special_item"]
mob_blacklist  = ["minecraft:zombie", "mymod:boss"]
mod_blacklist  = ["mymod", "anothermod"]

🔴 Chaos Mode

Setting chaos_mode = true skips everything — blacklists, spawn egg filter, and the natural drop filter. Every registered item enters the pool. A warning appears in chat when you join with chaos mode on.

⚠️ Some items may become unobtainable in chaos mode. Use at your own risk.

Before updating or changing settings

Back up your world and configuration files before making changes. Keep a copy of the old instance until you have checked that the updated setup works.

Notes

• Wrong tool = no drop — same as vanilla. A block that needs a pickaxe drops nothing without one.
• Same seed = same drops — two worlds sharing a seed will have identical randomization. Use /rbmdreshuffle to override.
• Each world is independent — worlds store their own seed and config hash in datapacks/rbmd_randomizer/. Switching between worlds never affects each other.
• Adding or removing mods — detected automatically. Drops will shift slightly since the pool size changes, but the same seed is reused so existing items stay as consistent as possible.
• Silk Touch — randomized by default. Set randomize_silk_touch = false if you want Silk Touch to always give the original block.
• Mods with hardcoded drops — mobs that skip the loot table system are still covered by an event hook on every mob death.
• Debugging — all output tagged [RBMD] in latest.log. Use /rbmddump to export a full human-readable list of every drop change.

Get help

Use Discord or the issue tracker. Include your Minecraft version, mod loader, project version, and steps to reproduce the problem.

Author and links

I create and maintain Randomized Block & Mob Drops as Dnydd (formerly known as dklyntly).

GitHub source · My CurseForge projects

Read the full license and the terms included with your version before editing or redistributing files. Permissions granted with earlier releases remain in effect.