Lockdown: Item & Effect Control

🔒 Lockdown

Lockdown is a lightweight, strictly server-side utility mod for NeoForge 1.21.1 designed to give server owners and modpack creators absolute authority over items, progression, and status effects.

Whether you’re building an RPG modpack, running a server with progression stages, or patching overpowered potion mechanics, Lockdown offers modular, zero-bloat control right out of the box.

⚡ Key Features at a Glance

• 🖥️ 100% Server-Side: Clients do not need to install the mod to join!
• 📈 Scoreboard Progression: Gate items or entire mods behind custom scoreboard levels.
• 🚫 Item Bans & Confiscation: Destroy blacklisted items instantly or gently prevent players from equipping/using them.
• 🧪 Status Effect Banning & Capping: Completely disallow unwanted effects or cap their amplifier (e.g., allow Strength I, but nerf Strength II).
• 🎯 Source Whitelisting (Bypass): Forbid an effect generally, but permit it if applied by specific potions or items.
• 🎒 Backpack Detection: Optional deep inspection for Sophisticated Backpacks.

📦 Module 1: ItemLocker

Take charge of how items are acquired and used:

• Prohibited Items: Destroys banned items as soon as they hit a player’s inventory. Violators are automatically logged into lockdownban.json.
• Blocked Items: Possession prevention — players cannot even pick up, hold, or take the item into their inventory, but unlike prohibited items, it is not destroyed.
• Scoreboard Level Gating:
  • Lock individual items to a required scoreboard score.
  • Lock entire mods at once (e.g., all items from mekanism require Level 10), with support for item-by-item exclusions.
• NBT Locks: Restrict item instances dynamically via custom NBT tags.

🧪 Module 2: EffectLocker

Rebalance potions and status effects without breaking gameplay immersion:

• Banning: Block any effect from registering on players.
• Amplifier Capping: Limit maximum effect strength (0 to 255). No more game-breaking custom potion amplifiers.
• Item-Based Bypass: Allow restricted effects only when triggered by specific items (e.g., allow Weakness exclusively from vanilla splash potions).
• Graceful Handling: Players still drink potions and eat food naturally (animations and resource consumption work normally); only the resulting status effect registration is intercepted.

🎒 Mod Compatibility

• Sophisticated Backpacks: Lockdown includes optional built-in support. If present, prohibited items hidden inside player backpacks will still be detected and confiscated. If not present, the mod runs cleanly without errors or bloat.

🛠️ Quick Commands Overview

All commands require Operator Permission Level 4 (/op).

• /lockdown item prohibitedList addFromHand | removeFromHand | list
• /lockdown item blockedList addFromHand | removeFromHand | list
• /lockdown item level item addFromHand <level>
• /lockdown item level mod addFromHand <level>
• /lockdown effect ban <effect>
• /lockdown effect cap <effect> <level>
• /lockdown effect bypass add <effect> <item>
• /lockdown scoreboard set <objective_name>

(Check our GitHub README for detailed config guides, placeholders, and full command syntax.)

📄 License & Modpacks

Lockdown is distributed under the MIT License. You are completely free to use it in any public or private modpack!