Tough As Nails
A mod that adds thirst and body temperature systems to enhance survival realism.
📖 Introduction
Tough As Nails has been developed by the Glitchfiend team (led by Forstride) since 2015. Coming from the same team as Biomes O' Plenty, it integrates naturally with environmental and climate systems, and has been ported steadily across every major Minecraft version from 1.7.10 through 1.21.1. It's effectively a standard component in serious survival modpacks now.
There are two core systems. One is the thirst gauge: let it drop and you get a Dehydration debuff that eventually deals direct damage, and drinking dirty river or lake water straight gives you food poisoning plus faster thirst. The only safe drink is Purified Water — boiled in a furnace or collected from a Rain Collector. The other is body temperature: a 0 (freezing) to 10 (scorching) scale that rises and falls in real time with biome, time of day, armor, nearby heat sources, and what you drink, and tipping to either extreme gives you frostbite or heatstroke.
**What sets it apart** from other survival mods is consistency and predictability. Pair it with Serene Seasons (same team) and seasonal change feeds directly into the temperature system — 'you must wear warm clothes in winter' becomes a natural progression pressure. Modpack configs let you enable/disable thirst and temperature independently, so you can tune the difficulty exactly as you want.
In RLCraft, it's famous for adding 'thirst' to the first-night cause-of-death list. In zombie apocalypse packs like DeceasedCraft, clean water becomes a real progression goal — building a purifier, setting up rainwater catchers, prepping warm clothes naturally lands on your to-do list, and the entire pack gains a layer of survival weight that plain hunger management can't produce.
🕒 When to Use This Mod
Pick it up when vanilla survival feels too safe, or when you want deserts and snowfields to actually mean something instead of just being a different palette. It only really lands at the start of a fresh world — patching it onto an established save just adds chores. And honestly, if managing thirst and temperature doesn't sound interesting to you, this one will feel like nagging the entire run.
📦 Where It Matters Most
In RLCraft it's a major reason 'died of thirst' joins the first-night cause-of-death list. In apocalypse packs like DeceasedCraft, clean water becomes a real resource — building a purifier or rigging up rainwater catchers turns into an actual progression goal, and the entire pack gains a layer of survival weight that vanilla hunger management could never produce on its own.
🎮 How It Changes Your Playthrough
It's not just 'harder' — it's a game where you have to look after your body. Topping off water bottles before crossing a desert, swapping into wool armor before heading to a snow biome, those tiny preparation rituals stack up across every session. The first few hours feel like an annoyance, but once it clicks, having the environment itself act as an enemy is genuinely immersive.
🚀 Getting Started — First 30 Minutes
In Tough As Nails, the first 30 minutes of prep decides how stable the rest of your run will be. Lock in the purification line and basic climate gear before you start dying to thirst or temperature damage.
Step 1 — Secure purified water (10 min)
First priority after spawning: 3–4 empty glass bottles + a working purification line.
- Sand → glass → glass bottle (vanilla recipe)
- Right-click on a river or lake to fill Dirty Water Bottles
- Dedicate one furnace to purification only — drop dirty bottles in the input slot, get purified bottles out
- Any fuel works — wood, coal, whatever
Never drink dirty water directly — food poisoning + accelerated thirst hit at once and take ages to recover from. Goal for step 1: have 2 purified water bottles in your inventory before the thirst bar drops even one notch.
Step 2 — Rain Collector + basic clothing (15 min)
For long-term operation, set up the Rain Collector and climate-appropriate clothing in parallel.
- Rain Collector: clay bricks (or regular bricks) + wooden planks. Auto-fills with purified water every time it rains — basically replaces the furnace purification loop
- Check your biome: F3 debug shows 'Biome' and 'Body Temperature'
- Hot biome (desert, jungle, Nether): Cloth Helmet/Chestplate — light cloth instead of wool
- Cold biome (snow, taiga): Wool Helmet/Chestplate — 8 wool = 1 chestplate
Step 3 — Prep your first drinks (5 min)
Use a brewing stand or Cauldron to prep two starter drinks.
- Lemonade or Cold Tea: -1 body temperature, mandatory before entering hot biomes
- Hot Cocoa or Warm Soup: +1 body temperature, mandatory before cold biomes
Keeping 2 bottles of each in your inventory is enough to ride out most environmental shifts.
Where to go next
- Craft a Canteen — holds 4 bottles of water in one slot, essential for long exploration
- Cooling Coil / Thermal Padding curios — stable operation even in extreme biomes
- Base setup: 3–4 Rain Collectors + 1 dedicated purification furnace running constantly
💡 Gameplay Tips
- **The fastest purification method is the furnace.** Put a Dirty Water Bottle in the *input slot* (not fuel) and smelt it — out comes a Purified Water Bottle. Dedicating a single furnace to water early on basically removes thirst as a worry.
- **Build a Rain Collector early** — it auto-fills with clean water every time it rains, skipping the purification step entirely.
- **Yellow temperature gauge = warning, red = immediate danger.** At red, you have about 30 seconds to change environment before damage starts stacking.
- **Hot biome prep**: Cooling Coil curio, Lemonade, Cold Tea, light Cloth armor. Carry 4–6 cold drinks before entering a desert or the Nether — it's the difference between exploring and dying.
- **Cold biome prep**: Wool armor is the baseline, and Hot Cocoa, Coffee, or Warm Soup raise body temperature fast. Plant torches around as you explore snow biomes — they double as quick warm-up spots.
- **Charcoal Filter / Filter**: a portable purification tool that replaces the furnace step. Some modpacks add extra items — search 'Filter' in JEI to see what's available in your pack.
- **Canteen**: a curio that holds multiple drinks worth of water. Far more inventory-efficient than carrying four bottles on long expeditions.
⚠️ Common Confusing Points
- • **Drinking dirty water directly** is the single most common mistake. Right-clicking on a river with an empty bottle fills it with dirty water — drink it and you get food poisoning + accelerated thirst. Always purify first.
- • **Temperature system not showing up?** Some modpacks disable temperature by default. Check F3 debug for 'Body Temperature' or verify `enableTemperature = true` in `config/toughasnails-server.toml`.
- • **Thirst and hunger are separate gauges.** Eating doesn't restore thirst — some foods (watermelon, apples) give a tiny amount, but they can't replace actually drinking water.
- • **Day/night temperature swings are larger than you'd expect.** A desert that's bearable at noon can give you frostbite at night. Pack night-appropriate gear when camping in deserts or plains.
❓ FAQ
Temperature system doesn't seem active — not visible in F3.
The modpack likely has temperature disabled. Open `config/toughasnails-server.toml` and change `enableTemperature = true`. Some kitchen-sink packs deliberately turn thirst on but leave temperature off, and if that's the intended design, it's usually best to leave it.
Which version of Tough As Nails should I install for 1.12.2 RLCraft?
RLCraft already bundles its own Tough As Nails 1.12.2 build, so no separate install needed. If it's missing, your modpack install is broken — re-download from the official RLCraft page. For 1.16+ modpacks, pick the NeoForge or Forge build that matches your Minecraft version.
Thirst drops really fast. Is that normal?
It feels fast early but it's normal — the rate depends on `thirstDecayMultiplier` in the modpack config, and thirst accelerates while sprinting, jumping, and fighting. Once you have a Canteen + Rain Collector pipeline going, late-game thirst basically becomes a non-issue. If it still feels too aggressive, tweak the multiplier in the config file.
Frostbite/heatstroke debuffs won't clear.
**Almost no natural recovery happens until you change environment.** For frostbite, move next to a torch or furnace immediately and drink Hot Cocoa or Warm Soup to raise body temperature. For heatstroke, find shade + Lemonade/Cold Tea. The debuffs clear automatically once temperature returns to the normal range (4–6).
Playing multiplayer with a friend — their thirst is fine but mine drops fast. Why?
Temperature and thirst are calculated **per player**, based on individual biome, armor, and recent actions. If your friend is standing in shade and you're sprinting through a desert, the gap will be large. If you get differences while doing the same thing in the same place, check server config (`tough-as-nails-server.toml`).
📦 Modpacks With This Mod
DeceasedCraft - Urban Zombie Apocalypse
A zombie apocalypse modpack set in a ruined urban world. Scavenge, survive, fight with firearms, and hold out against endless waves of the undead.
🎯 Best for Best for players who enjoy a heavy modern-apocalypse system layer (temperature, thirst, vehicles).
RLCraft
A hardcore modpack that transforms Minecraft into an extreme survival experience. Features thirst, body temperature, and a leveling system for realistic survival gameplay.
🎯 Best for A fit for players who embrace die-and-learn hardcore survival with deep build crafting.