No more challenges to face after beating the Ender Dragon? Face off against extremely hard bosses in Cataclysm! Fight Leviathan while holding your breath in the deep dark oceans, or avoid burning into ashes while fighting the Ignis in the Nether.



L_Ender's Cataclysm introduces a lot of new items, structures, and mobs into the game. This makes it easier for players new to the mod to get confused. Worry no more, as this article is here to assist you in progressing through this mod.
The bosses introduced by L_Ender's Cataclysm are much more powerful and challenging to beat when compared to the vanilla boss - The Ender Dragon. These new bosses are to be faced after the End game, and therefore this article assumes that the player has basic knowledge about certain game mechanics. For example, locating the stronghold housing the End portal using Eyes of Ender.
The bosses you are going to face in L_Ender's Cataclysm mod are much stronger than any boss in the vanilla game. Therefore, it is important that certain items are obtained before you challenge a boss. Let us take a look at how you can properly equip yourself to face a Cataclysm boss.
You are advised to equip yourself with a full set of Diamond or Netherite armor. Apply Protection IV enchantment on armor pieces. A shield is also mandatory as many of the bosses tend to utilize throwable or wave attacks. It is also highly recommended to enchant your boots with Feather Falling as many bosses tend to throw you around.


Keep plenty of Strength, Regeneration and Fire Resistance potions ready for use. Attacks from the new bosses will drain your health faster than you can blink, and proper regeneration is required to decrease chances of dying early.

Enchant your melee weapons with powerful enchantments like Sharpness V. You should carry projectile weapons like Bows or Crossbows. Apply Power IV or Piercing IV enchantments on them. Also, food sources like bread or steak are not going to be enough. Craft plenty of golden apples, as these will be your main food source while facing a boss.

Additionally, keep items like ender pearls, a water bucket and some building blocks ready-to-use in your hotbar. You will never know when you will need them. They might mean the difference between life and death in certain situations.

Now that you are all geared up. Let us start facing the real bosses.
The Netherite Monstrosity will be the first boss you are facing. This boss is stronger than any vanilla boss, but is much easier compared to the other bosses introduced by the Cataclysm mod. Let us take a look in detail at how you can find, fight and defeat this boss.

Structure: The Soul Forge
Dimension: The Nether
Locate the Soul Forge using an Eye of Monstrous
Maximum Health: 600HP (300 hearts)
Attack Style: Both Melee and Projectiles
Special Ability: Can use lava to regenerate health
Enters Berserk mode when health falls below 40%


Stay at close or medium range
Clear the arena of any lava to prevent regeneration
Use a strong melee weapon
Keep moving to avoid shockwave attacks
Use potions of regeneration
Defeating the Netherite Monstrosity will earn you certain items that will help you with your progression through this mod.
Infernal Forge: A powerful weapon which also works as a pickaxe.
Monstrous Horn: Used to craft the Monstrous Helm.
Lava Power Cells: Used to activate hidden features in the Soul Forge.
Music Disc: Spawn of Hell

After you have defeated the Netherite Monstrosity, the next boss in our list is the Ender Guardian. As suggested by the name, this boss spawns in the End dimension. Let us take a brief look at this boss.

Structure: The Ruined Citadel
Dimension: The End
Locate the Ruined Citadel using an Eye of Void
Maximum Health: 500HP (250 hearts)
Attack Style: Heavy melee slam attacks, Shockwaves, Charge attacks, Projectile-based energy attacks
Special Ability: High Knockback
Becomes faster and more aggressive as its health drops


Always wear Feather Falling enchanted boots
Stay moving, never stand stationary
Be on alert to dodge wave attacks
Utilize Strength II and Regeneration potions when the boss becomes more aggressive
Defeating the Ender Guardian will earn you certain items that will help you with your progression through this mod.
Gauntlet of Guard: A device that can pull mobs closer to you
Music Disc: The Citadel’s Last Stand

This is the first boss we will be facing in the overworld. Without any delay, let's get into the details.

Structure: Ancient Factory
Dimension: The Overworld
Locate the Ancient Factory using an Eye of Desolation
Right-click on the activator using a Nether Star to summon the boss
Maximum Health: 450HP (225 hearts)
Attack Style: Fast melee combo attacks, Ranged projectile barrages
Special Ability: Dash and teleport-style repositioning
Fires rapid energy projectiles that punish stationary players


Prioritize Mobility: Use enchanted boots and speed potions
Never stay stationary
Utilize ranged weapons: Bows and Crossbows
Avoid getting cornered in the arena
Witherite Block: 1 Witherite Block → 9 ingots
Witherite Ingots can be used to craft the following:
Meat Shredder: A strong melee weapon
Wither Assault Shoulder: Fires missiles
Gatling Gun: Rapid fire weapon that shoots items like redstone dust
Mechanical Fusion Anvil: Allows combining certain Cataclysm items

The next boss we will be facing is the Leviathan. This boss fight is unique as it mainly happens underwater. This makes the preparations necessary for this fight entirely different from the others.

Structure: Sunken City
Dimension: The Overworld - Ocean Biomes
Locate the Sunken City using an Eye of Abyss
Right-click on the activator using an Abyssal Sacrifice to summon the boss
Maximum Health: 600HP (300 hearts)
Attack Style: Heavy melee slam attacks, Charge attacks, Water blasts
Special Ability: Arena Flooding, High Knockback
Gains speed and attack frequency at lower health


Utilize boots enchanted with Depth Strider
Fight near the outer edges of the arena
Dodging sideways is far more effective than backing away
Use Ranged Weapons
Tidal Claws: A melee + ranged + grappling weapon
Abyssal Egg: Hatches into a Baby Leviathan pet when placed in water
Leviathan Music Disc

Unlike other bosses listed in this guide, Scylla is an optional boss. This is because many players do not consider defeating Scylla a requirement for progressing through Cataclysm.

Structure: Acropolis
Dimension: The Overworld - Above Ocean Biomes
Locate the Acropolis using an Eye of Storm
Right-click on the anchor to summon the boss
Maximum Health: 550HP (275 hearts)
Attack Style: Fast melee slash combos, Ranged projectile strikes
Special Ability: Dash and teleport-style repositioning
Can chain multiple attacks if the player is caught off-guard
Becomes more aggressive as health decreases


Stay near the arena center
Dodge sideways, not backwards
Use ranged weapons during recovery windows of the boss
Make sure no mobs remain in nearby rooms before summoning
Essence of the Storm: Used to craft Astrape and Ceraunus weapons
Lacrima
Music Disc: Rotch Gwylt

Ignis is considered to be the boss of all bosses in Cataclysm. It is a Nether based boss that is extremely powerful and has some unique abilities.

Structure: Burning Arena
Dimension: The Nether
Locate the Burning Arena using an Eye of Flame
Obtain Burning Ashes by killing the Blaze-like monster found within the structure. Right-click with it on the altar to summon the boss.
Maximum Health: 700HP (350 hearts)
Attack Style: Aggressive melee combo attacks, Wide flame cleave swings, Fire eruptions and ground slams
Floods parts of the arena with fire and lava hazards
Attacking outside safe windows often leads to instant retaliation
Gains new attacks and faster combos as health decreases


Bring multiple Fire Resistance potions
Ignis has very clear but short damage windows
Use Strength II, Regeneration, and Golden Apples during the aggressive phase
Avoid fighting near lava pools or arena edges
Strafing sideways keeps you out of follow-up swings and fire lines
Ignitium Shards: Used to craft Ignitium Armor
Ignis themed Music Disc

Make sure all required libraries and dependency mods are installed. These might be dependencies required by Cataclysm or other installed mods. Check for incompatible combinations too.
Cataclysm bosses are intentionally made extremely hard. These are bosses that you will have to face after defeating the Ender Dragon. You can always change various attributes of the bosses using configs.
Some bosses are summoned when the player reaches closer to it. Others require special summoning methods that are explained in the individual boss segments above.
The dimension in which the Cataclysm structures generate and the methods to find them are given in the individual segments above explaining each boss. Head over to the correct dimension and use the correct Eye to locate the structure.
Many of the bosses come with a chance of dropping unique music discs. But the most important loot are the powerful gear (or the materials required to craft them).
It supports multiple versions including 1.20.1 and 1.21.1 on Forge and NeoForge.
Loot is primarily found in Cataclysm dungeons; integration mods can enhance variety and rewards.
Add-ons like L_Ender’s Cataclysm Delight connect it with other mods, adding over 50 food items and effects.
Yes, many players include Cataclysm in large modpacks, but ensure dependencies & balance with other mods.
We think these additions will perfectly complement your gameplay
Realism without much stress on game performance. Bliss turns your game into a fantasy world, while maintaining the element of realism. Explore a fantasy filled adventures throughout all three dimensions.