Act III: Trial of the Immortals

Theme: High-tier ritual bosses, Cataclysm structures, and world-altering threats.
This act introduces the major bosses from the Cataclysm mod and shifts progression toward:

• Specialized Eyes that track disturbances
• Multi-stage structures and arenas
• Endgame-level combat challenges

Core Setup — Cataclysmic Rumblings

As you return to the Overworld after conquering other realms, your contacts among villages and tribes report:

• Tremors beneath deserts and frozen wastes
• Strange constructs awakening in long-abandoned ruins
• Shadows and serpents haunting the depths of the sea
• Prisons of souls flickering with necromantic energy

You’ve learned enough tricks with Ender Eyes to imbue them with resonant materials tied to each disturbance, crafting a set of specialized Eyes:

• Mech Eye – machine and redstone-infused
• Flame Eye – blaze, nether sand, and infernal metal
• Void Eye – End-infused, tied to ancient citadels
• Monstrous Eye – nether metal + lava essence
• Abyss Eye – frozen magma and drowned stone
• Desert Eye – relics from arid ruins
• Cursed Eye – necrotic and phantom-touched

Each Eye points to a Cataclysm structure containing an “immortal” threat. Act III is about tracking down and ending each of those threats.

Eye & Structure Flow (High Level)

• Cataclysmic Rumblings
  • Craft at least one specialized Eye using an Ender Eye + themed materials.
• Electric Eye → Ancient Factory → Harbinger
• Eye of Flames → Burning Arena → Ignis
• Void Eye → Ruined Citadel → Ender Golem & Guardian
• The Soul Forge → Netherite Monstrosity
• Eye of the Abyss → Sunken City → Abyssal Sacrifice → Leviathan
• Eye of the Desert → Cursed Pyramid → Ancient Remnant
• Evil Eye → Frosted Prison → Maledictus

Players don’t need to do them in a strict order, but all of them push toward the same theme:
you’re no longer just surviving – you’re cleaning up the cosmic mess left behind.

Boss & Encounter Guide

Netherite Monstrosity — The Soul Forge

Quest: The Netherite Construct
Mod: Cataclysm

How to Track It:

• Craft the Monstrous Eye using Eye of Ender, four Buckets of Lava, two Netherite Scraps, and two Blackstone.
• Use the Monstrous Eye to locate the Soul Forge structure.

What You’ll Find:

• A massive open forge filled with:
  • Chains, lava pits, smelteries, and anvils
  • Menacing constructs working the forge
• At its heart: the Netherite Monstrosity, a gigantic forged abomination.

Fight Notes:

• Heavy melee damage, big hitbox, punishing close range
• Resistant to knockback and fire
• Recommended:
  • Fire resistance
  • High armor and mobility
  • Ranged options for repositioning between attacks

Ignis — Warrior-God of Flame

Quest: Warrior-God of Flame
Mod: Cataclysm

How to Track It:

• Craft the Flame Eye with: 3 Blaze Powder, 2 Netherite Scrap, 1 Eye of Ender, and 3 Soul Sand.
• Use it to find the Burning Arena.

Arena & Ritual:

• Multifloor arena of brick and lava
• Lesser gladiators drop Burning Ashes
• Collect Burning Ashes and place them in the central brazier at the top level

This awakens Ignis, a towering warrior-god forged from flame and rage.

Fight Notes:

• Constant fire hazards and AOE flames
• Knock-ups and arena control elements
• Strongly recommended:
  • Fire Resistance + Fire Protection gear
  • A mix of melee burst and cautious ranged play
  • Extra regen / healing to offset chip damage

Ender Golem & Ender Guardian — Ruined Citadel

Quests:

• Ambulatory Statues – Ender Golem
• A Much Larger Ambulatory Statue – Ender Guardian

Mod: Cataclysm

How to Track It:

• Craft the Void Eye using 2 Endstone Bricks, 2 Purpur Blocks, 2 Purpur Pillars, an Eye of Ender, and 2 Shulker Shells.
• Use it in the End to locate the Ruined Citadel.

Structure:

• A fractured, yet well-preserved citadel floating in the End
• Packed with:
  • Traps on the floors
  • Hostile mobs
  • Living statues and box-like mollusks
  • Plenty of loot

Progression:

1. Ender Golem – patrols upper or mid levels.
2. Hidden trap door / deeper descent leads to the arena containing the Ender Guardian.

Fight Notes (Ender Golem):

• Functions as a mini-boss
• Melee-focused construct with significant durability

Fight Notes (Ender Guardian):

• Larger, heavily armed version; now the true boss
• Expect:
  • Shockwaves
  • High-damage melee
  • Arena-focused patterns
• Recommended:
  • Feather Falling and mobility
  • Good sustain and ranged options for when it becomes unsafe to stay in melee

The Harbinger — The Wither, Reborn

Quest: The Wither, Reborn
Mod: Cataclysm

How to Track It:

• Craft the Mech Eye from iron, redstone blocks, and Eye of Ender.
• Follow it to the Ancient Factory.

Structure:

• Advanced “ancient tech” facility packed with:
  • Mechanical constructs
  • Redstone machinery
  • Automaton workers

At the largest central chamber sits a dormant mechanized Wither on a dais:
the Harbinger.

How to Awaken It:

• Feed the construct a Nether Star.

Fight Notes:

• Hybrid of Wither behavior + mechanical enhancements
• Expect:
  • Projectile barrages
  • Arena control and potentially environmental hazards
• Recommended:
  • Wither protection (potions, regen, golden apples)
  • Strong ranged build with burst windows

Ancient Remnant — Cursed Pyramid

Quest: Preserved Remains
Mod: Cataclysm

How to Track It:

• Craft the Desert Eye from Eye of Ender, 2 Chiseled Sandstone, 1 Gold Ingot, 1 Emerald, 1 Dead Bush, 1 Cactus, 1 Rotten Flesh, and 1 Bone.
• Use it to locate the Cursed Pyramid.

Structure:

• Classic sandstone pyramid with:
  • Scorpions
  • Undead and fossilized lizardfolk
  • Deeper chambers housing greater fossilized figures

Ritual:

• Acquire a Desert Jewel Fragment — available from the Traveling Trader in the quest book.
• Craft the Necklace of the Desert.
• Present it as an offering in the inner chamber to awaken the Ancient Remnant.

Fight Notes:

• Large skeletal reptilian boss with desert-themed attacks
• Sand, projectiles, and possibly adds
• Recommended:
  • Good crowd control
  • Mobility + sustain
  • Sand / knockback awareness

The Leviathan — Great Serpent of the Deep

Quest: Great Serpent
Mod: Cataclysm

How to Track It:

• Craft the Abyss Eye using:
  • Eye of Ender
  • Crying Obsidian
• Use it to find the Sunken City.

Structure:

• A drowned metropolis of:
  • Stone colonnades
  • Prismarine streets
  • Alien sea culture (Deeplings and their constructs)

Ritual – Abyssal Sacrifice: To summon the Leviathan, craft Abyssal Sacrifice using:

• Athame from Deepling Warlocks
• Coral used in Deepling golem sentries
• Various ocean-related items (ink, shells, etc.)

Use the sacrifice item at the central altar to call forth The Leviathan.

Fight Notes:

• Large underwater serpent boss
• High mobility, wide area attacks
• Recommended:
  • Water Breathing (potion, enchantments, or gear)
  • Depth Strider / Dolphin’s Grace equivalents
  • Strong trident or ranged option that works underwater

Maledictus — A Compilation of Evil

Quest: A Compilation of Evil
Mod: Cataclysm

How to Track It:

• Craft the Cursed Eye from an Eye of Ender, 4 Gold Ingots, 2 Phantom Membranes, 1 Rotten Flesh, and 1 Bone.
• Use it to find the Frozen Penitentiary.

Structure:

• A frozen prison complex of stone in the wastes
• Packed with restless spirits and necrotic energies

Boss Trigger:

• Deep within lies a lone tombstone shrouded in an oppressive miasma.
• Touching the tombstone:
  • Swirls the dark mist
  • Summons Maledictus, a massive ghost built from many evil souls

Fight Notes:

• Spectral wings, room-wide darkness effects
• Composite attacks drawing on multiple “evil” archetypes
• Recommended:
  • Anti-undead tools (where applicable)
  • Light sources and damage mitigation
  • Balanced build; expect both ranged and melee pressure
  • Defeating him grants you rare loot including Stellothorn, a throwable scythe that returns to you and heals on hit, along with crafting materials for powerful gear and spells.

NightWarden — Powerful multiphase boss

Quest: NightWarden

Mod: T.O Magic 'n Extras — Iron's Spells Addon

How to Track It:

• Craft the Eye of Nothingness, then follow it to the boss.

  

• Found in the End dimension.

Structure:

• Found only within the Void Cathedral, a rare structure that spawns in the End dimension.

Boss Trigger:

• Right-clicking him opens a menu with hints about his gimmicks and lore.
• There are three difficulty options to choose from.
• You will need Excrucis to trigger him.

Fight Notes:

• He has damage adaptation, lifesteal, and three phases — the first is spell-based, the second is melee. His attacks often require high mobility to dodge.
• His damage adaptation can be dispelled with counterspell once you meet the requirement.
• On entering the third phase he casts supernova, which bypasses Abyssal Shroud, deals 10,000 damage, and spawns a massive black hole.

Act III Summary Table

Act III Completion

By the end of Act III, the player should:

• Have defeated all major Cataclysm “immortal” threats
• Collected high-tier gear and unique rewards
• Significantly advanced core stats and skills

From here, only the true End Game remains.