☣️ GasMask Addon V2.0.11 — Toxic Caves for Minecraft Bedrock

✅ Realms • Multiplayer • Addon Friendly • Achievements Friendly

🚫 No Experimental Gameplay • 🚫 No player.json

🌐 Official Page • 🚀 Discord Server

☣️ GasMask Addon

Do you want caves to feel more dangerous again?

GasMask Addon adds toxic underground zones to Minecraft Bedrock. The deeper you go, the more dangerous the air becomes, and you will need a gas mask with filters if you want to explore safely.

This version is a lot more complete than the old one. It now has a full guide book, personal settings, operator world settings, filter percentage stored inside each mask, configurable damage, configurable effects, toxic dimension options and optional compatibility with Novelty API.

🆕 Latest Update — V2.0.11

This update improves almost every important part of the addon.

Main changes

• Added GasMask Guide & Settings book
• Every player receives the guide automatically
• Added personal settings for each player
• Added world settings for operators
• Added configurable toxic dimensions
• Added 3 contamination levels: Light, Medium and Severe
• Added configurable Y levels for Overworld contamination
• Added configurable Nether and End contamination levels
• Added configurable gas damage
• Added configurable damage intervals
• Added configurable Nausea and Weakness levels
• Added configurable filter drain per contamination level
• Filters are now stored inside each mask as a percentage
• New masks start empty
• Masks can automatically install a Gas Filter from your inventory
• Each mask keeps its own filter percentage, even if moved, stored or given to another player
• Added low filter warning at 20% or less
• Added toxic fog personal toggle
• Added mask breathing sound personal toggle
• Added optional Novelty API Face Slot compatibility
• Operator settings are protected from normal players

☣️ How it works

By default, the Overworld becomes toxic underground.

The deeper you go, the stronger the contamination becomes.

Default Overworld levels:

• Safe: above Y 44
• Light contamination: Y 44 to Y 21
• Medium contamination: Y 20 to Y -3
• Severe contamination: Y -4 and below

If you enter a toxic zone without protection, you can receive toxic fog, Nausea, Weakness and direct gas damage depending on the zone.

Wearing a gas mask with a working filter protects you from the toxic air.

🌫️ Toxic Fog

GasMask includes custom green toxic fog for cave exploration.

The fog changes depending on the contamination level, so deeper zones feel more dangerous.

Players can disable the fog only for themselves from Personal Settings if they prefer a cleaner screen.

🎭 Gas Masks

The addon includes 4 gas masks:

All masks are enchantable and work as helmet-slot equipment.

The better the mask, the slower the filter drains.

Netherite Gas Mask is also fire resistant.

🧪 Gas Filters

Gas Filters are now much more important.

Each mask stores its own filter percentage.

A new mask starts Empty. When you enter toxic air with an empty mask, the addon automatically consumes one Gas Filter from your inventory and loads that mask to 100%.

The filter percentage stays with that exact mask, even if you:

• Move it in your inventory
• Put it in a chest
• Give it to another player
• Remove and equip it again

If the filter reaches 0% and you do not have another Gas Filter, the mask stops protecting you.

The addon also shows a warning when your filter reaches 20% or less, unless you disable that warning.

⚙️ Gas Filter Recipes

Gas Filters can be crafted using Coal or Charcoal.

Each recipe gives 2 Gas Filters.

Main ingredients:

• Leather
• Coal or Charcoal
• Iron Ingot
• Paper

🧰 Gas Mask Recipes

The Basic Gas Mask is crafted using Leather, Glass Panes, Iron Ingots and Gas Filters.

The upgraded masks use the previous mask as a base:

• Iron Gas Mask: upgrade from Basic Gas Mask with Iron Ingots
• Diamond Gas Mask: upgrade from Iron Gas Mask with Diamonds
• Netherite Gas Mask: upgrade from Diamond Gas Mask in the Smithing Table using a Netherite Upgrade Template and Netherite Ingot

Recipe Images

📘 GasMask Guide & Settings

Every player receives the GasMask Guide & Settings book after joining or respawning if they do not already have it.

Use the book to open the addon interface.

The guide includes:

• How the addon works
• Gas masks
• Gas filters
• Toxic zones
• Contamination levels
• Face Slot compatibility
• Settings explanation

This makes the addon easier to understand inside the game without needing to return to the description every time.

👤 Personal Settings

Each player has personal settings.

These only affect that player, not the whole world.

Personal settings include:

• Toxic Fog — show or hide the GasMask fog
• Mask Breathing — enable or disable breathing sounds
• Low Filter Warning — show or hide the warning at 20% filter or less

This is useful in multiplayer because one player can keep the full atmosphere while another player can disable fog or sounds.

🌍 World Settings

World Settings are only for operators or the world owner.

Normal players cannot change global settings.

World settings are split into clear sections so the configuration is not messy.

Toxic Dimensions

By default:

• Overworld: Enabled
• Nether: Disabled
• The End: Disabled

Operators can enable toxic zones in the Nether or End if they want a harder world.

Contamination Levels

The Overworld has 3 toxic levels:

• Light
• Medium
• Severe

Default values:

• Light starts at Y 44
• Medium starts at Y 20
• Severe starts at Y -4

The values must follow this order:

Light Y > Medium Y > Severe Y

Nether and End do not use Y levels. Instead, operators can choose their severity:

• 1 — Light
• 2 — Medium
• 3 — Severe

Default values:

• Nether: Medium
• The End: Severe

Gas Damage

Each contamination level can have its own damage and interval.

Default direct gas damage:

• Light: 0.5 hearts every 4 seconds
• Medium: 0.5 hearts every 3 seconds
• Severe: 1 heart every 2 seconds

Set the damage to 0 if you want a level to have no direct gas damage.

Negative Effects

Each contamination level can also have its own Nausea and Weakness strength.

Effect values:

• 0 = disabled
• 1 = level I
• 2 = level II
• Up to level V

Defaults:

• Light: Nausea I, Weakness disabled
• Medium: Nausea II, Weakness I
• Severe: Nausea III, Weakness II

Filter Drain

Filter drain can also be changed per contamination level.

Default drain for the Basic Gas Mask:

• Light: 10% per minute
• Medium: 12.5% per minute
• Severe: 15% per minute

Iron, Diamond and Netherite masks are more efficient and drain slower.

Set a level to 0% if you want filters to stop draining in that contamination level.

🧩 Novelty API Compatibility

Novelty API is optional.

If you use Novelty API, the masks can work with the Face Slot.

If you do not use Novelty API, the masks still work normally in the vanilla helmet slot.

The addon includes the novelty:is_face item tag for the masks.

✅ Compatibility

• ✅ Compatible with other addons
• ✅ Realms support
• ✅ Multiplayer support
• ✅ Achievements friendly
• ✅ No experimental gameplay required
• ✅ Optional Novelty API support
• 🚫 Does not use player.json

📦 Installation Guide

You must install both packs:

• GasMask BP/BH — behavior, scripts, items and mechanics
• GasMask RP/RS — textures, models, fogs, names and resources

Both files are required for the addon to work properly.

Activate both packs in your Minecraft Bedrock world.

📜 Previous Updates

🚀 Join the Community

Want to report a bug, suggest something or request a custom Minecraft Bedrock addon?

🚀 Join my Discord Server

There you can request custom commissions, see addon progress and stay updated with new releases.

🌐 Official Page

You can find my other addons and newer versions here:

🌐 Visit StvAddons

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If you enjoy my addons and want to support future updates:

💖 Donate

Thank you for the support ❤️