Tempered in Flame Add-on 1.21+

When the flame tempers, even the nether transforms. This is the slogan of the mod Tempered in Flame, which completely overhauls the generation of all Nether biomes in Minecraft, adding new plants, structures, and even layers to the Nether dimension. Fortresses and bastions now adapt to the environment, and each biome has received unique features and inhabitants.

Warped Forest

Many new plants and Endermites

Warped Nether Fortress

Warped Piglin Bastion

Crimson Forest

Similar to the Warped Forest, but instead of twisting vines, there is a new plant — Crimson Sprouts

Crimson Nether Fortress

Crimson Piglin Bastion

Basalt Deltas

Blazes and a new boss — the Hovering Inferno appear

Soul Sand Valley

A plethora of new plants, spikes, and Wolf Skeletons

Wither Skeletons now also appear here

Soul Fortress

Soul Bastion

Nether Wastes

Spikes and Zoglins have appeared everywhere

A new sub-biome called Ashlands has appeared

Nether Wastes Bastion

Ashlands

Nether Layers

The Nether now consists of 3 distinct layers: Upper, Lower, and Middle

Upper Nether

Contains a new block, Nether Slate, an Orange variant of Deepslate, as well as many types of ores

Lower Level

Contains tons of Obsidian and Crying Obsidian, with a higher chance of Netherite ore appearing

Plasma Magma Crystal

Used for crafting and manufacturing Calibrated Fire Charges, which can be thrown

Nether Magma Crystal

Magma Crystal

Piglin Mine

The most dangerous structure in the add-on due to its many Piglins

Soul Forge

Contains a new crafting block — Soul Forge, which is used for crafting many items

Houses in the Crimson Forest

Giant Sword in the Stone

Contains 4 chests

Basalt Magma Base

Contains 1 hidden chest

Quartz Geodes

Soul Quartz

Nether Quartz Geodes

Ghast Balloon

Hovering Inferno

Spore Creepers

Nether Creeper

Nether Mushroom Cows

Nether Cow

Piglin Miner

Pyrogen

A unique boss that appears if you cover a Tempered Forge block with lava in the Nether

A wide range of attacks, including shooting fireballs, summoning Evocation Fangs, and using spinning weapons around itself to turn into a saw

Drop: Fire Forge Smithing Template — a special item used in the Soul Forge to create gear better than Netherite

Battle Axes

Deal 4 more damage than swords

On hit, the player receives Weakness 3 and Slowness 2

Pierce Shields

Thorns

A throwable weapon that deals damage upon landing

Emerald Items

Iron durability, but damage and protection of Diamond

Ruby Items

Diamond and Netherite characteristics for weapons and tools respectively

Obsidian Items

4 times stronger than Diamond, but other characteristics equal to Iron

Pyroplastic Items

The strongest set of gear in the add-on

An upgrade to Netherite items

All items are completely indestructible