Core Keeper • Boss Guide
Atlantean Worm
Biome: The Sunken Sea (Roaming) HP: Massive Last updated: 2026-02-28
How to summon / find
Roams the outer ring of the Sunken Sea.
Recommended food focus
Pick one main meal plan that fits this fight, then keep one backup plan (survival or extra damage).
Ranged Damage Movement Speed.
Prep checklist
Bring these before you start—this is the fastest “stop dying” layer.
- ✓ Speeder Boat
- ✓ Long Range Weapon
- ✓ Movement Speed Food
- ✓ Swiftness Potion
Deadly attacks to dodge
If you learn only 3 things, learn these. They cause most wipes.
Body Slam
The worm's body segments deal massive damage.
How to dodge: Maintain distance and never let it touch your boat.
Water Spit
Fires projectiles from its segments.
How to dodge: Steer the boat in a zig-zag pattern.
Core mechanics
Giant sea worm that roams the ocean. Destroys boats on contact.
Win strategy
Use a high-speed boat and long-range weapons to chip away while staying ahead.
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.
Primary plan
Top pick
Pinegrapple + Iron Tail
- • ranged damage: +22%
- • crit chance: +13%
Tip: avoid overlapping buffs—pick a focused combo.
Top pick
Iron Tail + Desert Sunfish
- • crit chance: +13%
- • ranged damage: +22%
Tip: avoid overlapping buffs—pick a focused combo.
Top pick
Pinegrapple + Emerald Feather Fish
- • ranged damage: +22%
- • crit chance: +7%
Tip: avoid overlapping buffs—pick a focused combo.
Top pick
Emerald Feather Fish + Desert Sunfish
- • crit chance: +7%
- • ranged damage: +22%
Tip: avoid overlapping buffs—pick a focused combo.
Backup plan
Backup pick
Ancient Seed + Golden Puffungi
- • move speed: +36%
- • rarity boost: +1 Tier
Backup pick
Ancient Seed + Starlight Nautilus
- • move speed: +36%
- • rarity boost: +1 Tier
Backup pick
Bomb Pepper + Ancient Seed
- • move speed: +36%
Common mistakes
Read this if you keep failing. It’s usually one of these.
- • Boat being too slow
- • Getting too close
- • Running out of speed buffs
Key drops
What you’re actually here for—and what it’s used for.
Atlantean Chest
Massive storage container.
Worm Ring
Increases damage against large enemies.
Need golden ingredients faster?
Farming by hand slows down progression. Automate golden crops to power your best food buffs.
Related
FAQ
What food should I bring to Atlantean Worm?
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.