Incendium Biomes¶
Incendium replaces the vanilla Nether with 8 new biomes, each with distinct terrain, mobs, ambient sounds, and exploration opportunities. Before diving into each biome, it helps to understand the system that makes several of them possible.
3D Biomes¶
How 3D Biomes Work
Vanilla Minecraft assigns biomes based on horizontal (X/Z) coordinates alone — wherever you stand, the biome is the same from bedrock to the ceiling. Incendium breaks this limitation. With the Nether height expanded from 128 to 192 blocks, Incendium assigns biomes at different Y-levels independently.
In practice, this means you might be walking through the Quartz Flats at ground level, look up, and see the roots of an Inverted Forest growing downward from the ceiling 100 blocks above you. Different biomes coexist vertically within the same column of chunks.
This system is most visible with the Inverted Forest, which exclusively generates as an upper-layer biome hanging from the Nether ceiling above other ground-level biomes.
Ash Barrens¶
The Ash Barrens are vast, desolate plains blanketed in thick layers of ash. Beneath the gray surface lie the remnants of ancient lava lakes — long since cooled and buried. The terrain is relatively flat compared to other Incendium biomes, making it easy to traverse but dangerously exposed. Hostile mobs have clear lines of sight, and there is little natural cover.
The defining landmark of the Ash Barrens is the Forbidden Castle, a massive jigsaw-generated fortress that looms over the ashen landscape. If you spot dark spires rising from the gray horizon, you have found it — and you should prepare accordingly before approaching.
Traversal
The flat, open terrain makes the Ash Barrens one of the easier biomes to navigate. Use this to your advantage when scouting — you can spot the Forbidden Castle's towers from a considerable distance. Build a small forward base before attempting the castle itself.
Warning
The lack of cover works both ways. Ghast fireballs and ranged mobs can target you from far away with nothing to hide behind. Keep a shield ready or stay near terrain features.
Infernal Dunes¶
Rolling dunes of red-hot sand stretch across the Infernal Dunes, broken by smoking volcanic craters that belch fire and ash into the air. The sand itself radiates heat — the entire biome feels alive and hostile. Pools of lava bubble up between the dunes, and the terrain shifts between towering sand ridges and deep, treacherous valleys.
Desert Blazes patrol the dunes, a custom mob variant unique to this biome. They are more aggressive than standard Blazes and are well-camouflaged against the red-orange terrain.
The Infernal Altar generates in this biome — a domed structure that serves as the summoning site for the Hovering Inferno boss. Finding it is the first step toward Incendium's ultimate challenge.
Spotting the Altar
Look for a large dome structure rising above the dune line. The Infernal Altar is sizeable enough to be visible from a distance, but the uneven terrain can hide it behind sand ridges. Climbing to high points on the dunes gives you the best vantage.
Desert Blaze Behavior
Desert Blazes function similarly to vanilla Blazes but deal more damage and have slightly higher health. They blend in with the red sand, so watch for their particles and listen for their ambient sounds. Fire Resistance potions are highly recommended when exploring this biome.
Inverted Forest¶
The Inverted Forest is Incendium's most visually striking biome. Massive trees grow upside-down from the Nether ceiling, their trunks anchored to the roof and their canopies hanging downward into the open air. Vines, roots, and foliage cascade hundreds of blocks toward the ground, creating a surreal overhead jungle.
Because this is a 3D biome, the Inverted Forest generates exclusively at upper Y-levels, above other ground-level biomes. You might be exploring the Quartz Flats or Weeping Valley on the ground floor and look up to see an entire forest suspended overhead.
Reaching the Inverted Forest
Since the Inverted Forest clings to the ceiling, reaching it requires vertical travel. Build a pillar, use scaffolding, or fire Ender Pearls upward to reach the canopy. Once you are up there, moving between trees can be done by bridging across branches and vine networks.
Fall Damage
The Inverted Forest is high above the Nether floor. A fall from the canopy is almost certainly fatal without Feather Falling or a water bucket (which, of course, does not work in the Nether). Bring backup — Ender Pearls, Slow Falling potions, or a Twisting Vine to climb down safely.
Quartz Flats¶
The Quartz Flats are a gleaming, almost ethereal landscape of white and pale blue. Massive formations of quartz dominate the terrain, and frozen lava seas — lava lakes that have solidified into dark, glassy surfaces — carve through the quartz fields. The biome has an almost heavenly quality, a stark contrast to the rest of the Nether's hostility.
This biome is home to several notable points of interest:
- The Sanctum, a massive quartz church built by Illagers, is the biome's primary structure — and one of Incendium's most dangerous dungeons.
- Abandoned Towers dot the landscape, each containing a Ghastling — a baby Ghast companion you can rescue and keep as a pet.
- The Quartz Kitchen is a small structure guarded by Torte, a skeleton chef with a culinary grudge.
Rich in Resources
The Quartz Flats are an excellent source of Nether Quartz. The terrain itself is largely made of quartz blocks and variants, making mining here extremely productive if you need quartz for building or XP.
Ghastling Companions
Ghastlings rescued from Abandoned Towers will follow you and even attack Ghasts on your behalf. They are one of Incendium's most charming additions. See the Items & Mobs page for full details on Ghastling behavior.
Toxic Heap¶
The Toxic Heap is a nuclear wasteland. The terrain is scarred and cratered, covered in sickly greens and yellows. Pools of poisonous sludge dot the landscape, and the air itself feels wrong — thick with particles that suggest radiation and decay. This is not a biome that welcomes visitors.
Toxic Slimes spawn throughout the area, splitting into smaller slimes when killed, each one leaving behind lingering poison. The source of all this contamination is the Nether Reactor, a structure at the biome's heart that has been leaking pollutants into the surrounding terrain. The Nether Reactor is guarded by the Radiation Director, a powerful custom mob.
Environmental Hazards
The sludge pools in the Toxic Heap inflict poison and other negative effects on contact. Do not wade through them. Bring milk buckets or golden apples to counter the debuffs, and consider wearing a Hazmat Suit if you have found one — it provides resistance to the biome's environmental effects.
Approaching the Nether Reactor
The Nether Reactor is heavily guarded. Clear the surrounding area of Toxic Slimes first — fighting the Radiation Director while dodging slime splits is a recipe for disaster. Ranged weapons help considerably.
Volcanic Deltas¶
The Volcanic Deltas are an extreme landscape of magma and basalt, pushed to its most hostile expression. Rivers of lava cascade through jagged basalt formations, and the ground is a patchwork of magma blocks, blackstone, and unstable terrain. This biome is arguably the most dangerous to simply walk through — the terrain itself is the primary threat.
There are no major structures in the Volcanic Deltas, but the biome serves as a natural barrier between other regions. Navigating through it requires careful movement and constant awareness of lava flows.
Magma Blocks
Magma blocks deal constant damage when you stand on them without crouching. In the Volcanic Deltas, they are everywhere. Equip boots with Frost Walker to neutralize the damage, or crouch-walk — though this slows you considerably.
Shortcutting Through
If you need to cross the Volcanic Deltas rather than explore them, consider bridging over the worst sections with cobblestone or other blast-resistant blocks. Fire Resistance potions make accidental lava dips survivable.
Weeping Valley¶
The Weeping Valley is an eerie, dark biome defined by its oppressive atmosphere. Visibility is low, the ambient light is dim, and the soundscape is dominated by howling winds and the distant cries of Ghasts echoing through unseen caverns. Weeping vines drape from every surface, and the terrain is uneven and claustrophobic.
This is a biome that plays on tension rather than direct danger. The mobs here are not notably tougher than elsewhere, but the limited visibility and unsettling audio design make every encounter feel more threatening. You will hear things you cannot see, and see shadows that may or may not be hostile.
Light Sources
Bring plenty of torches or other light sources. The Weeping Valley's darkness makes it easy to walk into hazards or mobs you did not see coming. Placing torches as you go also helps you find your way back out.
Ambient Sounds
The Ghast cries you hear in the Weeping Valley are largely ambient — not all of them indicate a real Ghast nearby. However, some are real. Stay alert and do not assume every cry is just atmosphere.
Withered Forest¶
The Withered Forest is an ancient battlefield where some long-forgotten war left its mark on the Nether itself. Dead, blackened trees stand in rows like grave markers, and the ground is littered with the remnants of conflict. The atmosphere is heavy with decay and lingering malice.
This biome is haunted by Restless Spirits — ghostly entities that drift through the dead trees and attack on sight. Headless Warriors, remnants of fallen soldiers, patrol the forest floor alongside Withered Scientists, mad experimenters who refused to die. The biome's primary structure, the Ruined Lab, is a spherical laboratory guarded by buffed Wither Skeletons that hit significantly harder than their vanilla counterparts.
Restless Spirits
Restless Spirits can be difficult to see against the dark terrain of the Withered Forest. They are partially transparent and move silently until they attack. Keep your camera moving and watch for their glow effect.
Smite Enchantment
Many of the mobs in the Withered Forest are undead — Wither Skeletons, Headless Warriors, and Restless Spirits all take bonus damage from the Smite enchantment. A Smite V sword makes clearing this biome significantly faster.
The Ruined Lab
The Ruined Lab is a spherical structure partially buried in the terrain. Inside, buffed Wither Skeletons guard loot chests. These are notably stronger than standard Wither Skeletons — they deal more damage and have increased health. Approach with caution and strong armor.