Core Keeper • Boss Guide

Igneous the Molten Mass

Biome: Molten Quarry HP: Very High Last updated: 2026-02-28

How to summon / find

Found naturally in the Molten Quarry on a magma slime sigil.

Recommended food focus

Pick one main meal plan that fits this fight, then keep one backup plan (survival or extra damage).

Boss Damage Fire Resistance.

Prep checklist

Bring these before you start—this is the fastest “stop dying” layer.

  • Fire Proof Gear
  • High DPS Ranged Weapon
  • Fire Resistance Potion
  • Swiftness Potion

Deadly attacks to dodge

If you learn only 3 things, learn these. They cause most wipes.

Magma Leap
Jumps and leaves a pool of lava.
How to dodge: Dodge the shadow and stay away from the landing site.
Fire Wave
Sends a wave of fire outwards.
How to dodge: Dash through or around the wave.

Core mechanics

Giant magma slime. Leaves burning trails and deals massive fire damage.

Win strategy

Equip fire-proof gear. Avoid standing in the lava trails he creates during jumps.

Best food for this boss

Pick 1 meal from the primary plan. If you’re dying, switch to the backup plan instead of forcing DPS.

View all tier lists →

Primary plan

Top pick
Larva Meat + Golden Puffungi
  • • boss damage: +30%
  • • rarity boost: +1 Tier
Tip: avoid overlapping buffs—pick a focused combo.
Top pick
Larva Meat + Starlight Nautilus
  • • boss damage: +30%
  • • rarity boost: +1 Tier
Tip: avoid overlapping buffs—pick a focused combo.
Top pick
Bomb Pepper + Larva Meat
  • • move speed: +21%
  • • boss damage: +30%
Tip: avoid overlapping buffs—pick a focused combo.
Top pick
Heart Berry + Larva Meat
  • • max health: +25
  • • health regen: +2.2 HP/s
  • • boss damage: +30%
Tip: avoid overlapping buffs—pick a focused combo.

Common mistakes

Read this if you keep failing. It’s usually one of these.

  • No fire protection
  • Standing in lava trails
  • Low ranged DPS

Key drops

What you’re actually here for—and what it’s used for.

Igneous' Ring
Increases fire damage.
Magma Slime Oil
Summons the Magma Merchant.

Need golden ingredients faster?

Farming by hand slows down progression. Automate golden crops to power your best food buffs.

Auto-farm guide →

Related

FAQ

What food should I bring to Igneous the Molten Mass?
Bring 1 main plan (damage or survival) plus 1 backup plan. Avoid overlapping buffs—buffs of the same type usually get overwritten by the last meal you eat.
Do food buffs stack in Core Keeper?
Not usually. Buffs of the same type tend to overwrite, so pick a focused combo instead of stacking many similar meals.
How do I farm ingredients faster?
Automate crops. A golden crop farm is the fastest way to remove the cooking grind for endgame buffs.