The Lava Eater‘s Nest is a Nether miniboss lair from Legendary Monsters, one of the mod’s smaller structures with just one buried chamber in it. A sleeping Lava Eater lies inside, and there are a couple of 
Chests to open once it’s dealt with.
The nest generates underground, so you’ll be tracking it with an 
Eye Of Magma and digging down to it. What you’re going for is the three 
Lava Eater’s Skin the boss drops, which is the only material the 
Fiery Jaw and the 
Fiery Boots are built from. Both Chests roll vanilla Bastion Bridge loot on top of that, so the trip pays even before the fight starts.
Finding the Structure
The nest only generates in the Nether, in Nether Wastes and in the Erupting Inferno biome if you’re running Biomes O’ Plenty. Nests sit about 25 chunks apart, so they’re spread evenly and one is rarely more than a few hundred blocks away. The thing that catches people out is the depth, as the chamber is carved well below the 
Netherrack surface.
The Eye Of Magma is what finds it. Four 
Magma Blocks around one 
Ender Pearl makes one, and throwing it in the Nether sends it off toward the nearest nest exactly like an 
Eye of Ender. It searches about 100 chunks, so if there’s nothing in range it simply won’t throw and you keep the eye.
The steps below are the whole search, and on a normal Nether trip it’s rarely more than two throws, as the nests are so close together. Most of the effort goes into the digging at the end rather than the walking.
Craft a Handful of Eyes
Magma Blocks and Ender Pearls
Each throw has the same chance of breaking as a normal Eye of Ender does, so bring three or four rather than one. Magma Blocks are everywhere in the Nether and the Pearls are the limiting part, so stock up on those before you set out.
Throw and Follow
It runs ahead before it drops
Keep throwing and walking until the eye stops traveling. It’s a normal Eye of Ender underneath, so while the nest is still far off it climbs and runs ahead of you, and it only heads for the real spot once you’re nearly standing on it.
Dig Straight Down
Carefully, there’s Lava inside
You’ll break into the chamber from above, which is a drop into a room with Lava in it. Bridge in or pillar down rather than falling, and bear in mind that breaking through also means the Lava Eater can see you the moment you land.
Only one vanilla biome generates the nest, and that’s Nether Wastes. Biomes O’ Plenty adds the Erupting Inferno if it’s installed, but in a plain game it’s Nether Wastes or nothing, so check the biome before you start throwing Eyes.
So if you’re in a Soul Sand Valley or a Basalt Delta, you’re in the wrong place. The Eye won’t throw until there’s a nest within 100 chunks, which usually means crossing into Nether Wastes first.
Layout
There’s only one room, which makes the nest one of the simpler structures in the mod. It’s a squared-off pit 19 blocks across and 9 blocks tall, cut straight out of the Netherrack, and it has no door, no gate and no hidden room to hunt for. Unless a natural cave happens to break into it you’ll be making your own entrance through the roof.
The floor is a patchwork of Netherrack, 
Smooth Basalt and 
Blackstone, with 
Polished Blackstone Bricks and some 
Gilded Blackstone worked into it, which is worth mining while you’re down there. Magma Blocks are set into the floor as well, so parts of the ground hurt to stand on. There’s Lava sunk flush into the floor too, and it’s easy to walk into backwards while you’re circling.
Basalt columns rise out of the floor around the room. They break line of sight and give you something to put between you and the boss, though they won’t stop it for long. A 
Skeleton Skull and a lit 
Soul Campfire are worked into the stone as well, which is about as close as the nest gets to telling a story.
Mobs
The structure places exactly one creature, the Lava Eater itself, and it’s already asleep when the chunk generates. Anything else you run into wandered in on its own, so expect the usual Nether Wastes crowd of 
Zombified Piglins, 
Magma Cubes and the occasional 
Ghast if your tunnel opened a path for them. There are no guards, no adds and nothing the boss summons mid-fight.
While it’s asleep the Lava Eater takes no damage and won’t accept any potion effect, so neither a hit nor a Splash Potion does anything. It wakes as soon as it can see a player within 15 blocks, and with the room only 19 blocks across, dropping in at all starts the fight. That’s why you gear up before you break the ceiling, not after.
It wakes at 15 blocks as long as it has line of sight, and the whole chamber is 19 blocks across, so there’s nowhere in the room to hide from it. Plan on killing the Lava Eater first and looting afterward.
Its defenses are the part that changes how you fight, and most of them can’t be worked around. Read the list below before you pick a weapon, as a couple of the usual Nether favorites do nothing at all against it.
- Arrows are ignored completely while the projectile immunity option is on, which it is by default, so a Bow build has nothing to offer here. A thrown Trident counts as an Arrow for this too.
- Fire, Lava, Hot Floor and fall damage all do nothing to it, meaning the arena’s own hazards are a threat to you only.
- Damage is capped at 21 per hit, so a big one-shot weapon is wasted and steady swings do the same job.
- Standing 4 or more blocks above or below it makes it take no damage, and it smashes the blocks around itself every couple of hits anyway.
- Knockback doesn’t shift it at all, so you can’t shove it off you to make space.
- Lose its attention for about three seconds and it heals 20 health every three quarters of a second, which undoes a whole fight in moments.
What’s left is Sword hits, Splash Potions of Harming and explosions, and of those the Sword is the one you’ll actually use. Everything else on the list is a reason to leave the 
Bow and the Fire Aspect at home.
Loot
Both Chests use the vanilla Bastion Bridge table, the same one the bridge bastions roll, so the headline prize is a Netherite Upgrade Smithing Template at 10% per Chest. A 
Lodestone is guaranteed in each of them as well, which is two free Lodestones for the price of the trip.
Nest Chest Loot
Lodestone 
Smithing Template 
Smithing Template 
Gilded Blackstone 
Crying Obsidian 
Spectral Arrow 
Crossbow 
Block of Gold 
Gold Ingot 
Iron Ingot 
Golden Sword 
Golden Axe 
Golden Helmet 
Golden Chestplate 
Golden Leggings 
Golden Boots 
Arrow 
Gold Nugget 
Iron Nugget 
String 
Leather The Lava Eater‘s own drop is fixed, with no rolls and no rare tier to chase. It gives three Lava Eater’s Skin every time, and they’re fireproof items that glow and hang around far longer than a normal drop before despawning, so they’ll sit safely in a Lava pool until you fish them out.
Lava Eater Drops
Three Skin is the number that decides your trip. The Fiery Jaw takes all three along with three Blackstone, two Iron Ingots and a Magma Block, and it’s an axe with 750 durability whose right-click breathes fire and shoves everything within 3 blocks away, on a 10 second cooldown.
The Fiery Boots only need two Skin and two 
Magma Cream. They give 5 armor, and a key press leaves a trail of fire columns behind you for about 15 seconds, which is useful when something is on your heels.
So one nest gets you the Jaw or the Boots, not both, and you’ll want a second nest to finish the pair. Skin is also the repair material for both of them, which is another reason to keep a spare rather than spending everything on the first craft.
The Boss
There’s no summoning block and no ritual, the Lava Eater is simply lying there and walking into the room starts it. It stands up in about a second and comes straight at you, and there’s no boss bar to track, so you’re judging its health by how long you’ve been swinging.
Up close it bites, spins and slams, and most of those hits set you on fire as well as disabling a raised 
Shield for a couple of seconds. The slam is the one to watch, as it sends lines of fire columns racing outward across the floor, so keep moving after you dodge it rather than standing still.
Its signature move is the burrow, where it sinks into the ground, surfaces under you and grabs you while it chews. A raised Shield stops the grab outright, though it disables the Shield for about ten seconds. The full attack breakdown, with every damage number, is on the Lava Eater page.
Exploration & Strategy
The nest is small and the fight is short if you come prepared, so the list below is mostly about not burning. The Potions of Fire Resistance are the item that matters most, and everything else is there to cover a bad landing.
Fire Resistance is doing more work here than armor is. Nearly everything the Lava Eater has sets you alight, the floor is dotted with Magma Blocks, and there’s Lava to be launched into, so a Potion leaves you taking only the hits themselves. Set a 
Respawn Anchor before you break in, as dying here means a long walk back to a boss at full health.
Fight it on the floor and keep it there, since climbing 4 blocks up makes it immune and it’ll break your pillar out from under you anyway. Bridge over the Lava before the fight if you get a spare moment, or at least note where it is, as the slam throws you a long way. A Basalt column between you and it buys a second or two of breathing room.
Whatever you do, don’t run. Once it loses you for about three seconds it starts healing 20 health at a time, and if it has no target and has strayed more than 15 blocks from where it spawned it teleports straight back there. Trade steadily instead, keep the Shield up when it burrows, and loot both Chests once it’s down.
FAQ
It only appears in the Nether, in Nether Wastes, plus the Erupting Inferno biome if you have Biomes O’ Plenty installed. It generates well underground, so you’ll be digging in from above once an Eye Of Magma has marked the spot.
Not really, as the boss wakes the moment it can see a player within 15 blocks, and the chamber is only 19 blocks across. That leaves very little of the room outside its wake radius. You might get a Chest open before it reaches you, though you’ll still be fighting it afterward.
Projectile immunity is on by default, so every Arrow from a Bow or Crossbow is ignored, and a thrown 
Trident goes the same way. A config option called Allow Lava Eater Projectile Immunity turns it off if you want a ranged fight. Standing 4 or more blocks above or below it also makes it take nothing, which catches out anyone trying to pillar up.
Two, as a kill gives exactly three Lava Eater’s Skin and the Fiery Jaw eats all three on its own. The Fiery Boots only need two, so a single nest will get you the Boots with one Skin spare for repairs. There’s no way to farm the Skin otherwise, the Lava Eater doesn’t spawn anywhere outside its nest and it doesn’t come back once it’s dead.
