Atlantean Worm

The Atlantean Worm is a boss encountered in the Sunken Sea. It is a large serpent-like creature that normally travels in a circular path through the biome and can be revealed on the map with an Atlantean Worm Scanner. It cannot be damaged or attack the player until it is brought to the surface with a Bait Pillar.

Summoning it is a progression-heavy process: the Bait Pillar is obtained through the Brave Merchant, who in turn requires a Nuclear Battery, which is earned by defeating a Challenge Arena. Once the pillar is placed near the worm, it surfaces and becomes vulnerable. When defeated, it respawns immediately at a random point along its patrol route.

In combat, the Atlantean Worm lunges at the player with its mouth and spikes and may also perform an energetic attack that bursts into many small projectiles in a circular pattern. Its weak points are marked in blue along its body, and these are the only places that can be damaged. When a weak point is destroyed, a shorter worm segment splits off from the body, depending on where the weak point was located. These extra segments can also fire energy attacks and can make the fight much more dangerous if too many weak points are broken at once.

Like Ghorm the Devourer, the Atlantean Worm destroys almost anything in its path, including Obsidian Blocks, and any ground tiles it passes over are replaced with sea water. If all players die or leave the area during the fight, it submerges again and must be summoned a second time with a new Bait Pillar.

• Prepare the arena before summoning it by clearing a large open space or finding open water where a boat can be used.
• Bring food and healing supplies suited to either ranged or melee combat.
• Place the Bait Pillar in water near the worm; if the summon succeeds, a rumbling sound will play.
• If the pillar does not trigger the fight, breaking and replacing it may not be enough; moving farther into the Sunken Sea or using the scanner can help locate the worm.
• Do not focus the head, since it cannot be damaged. Target the blue weak points on the body instead.
• It is often safer to destroy one weak point at a time, then clear the spawned segments before opening another weak point.
• Be careful around the detached segments, since their energy attacks deal heavy damage.

Defeating the Atlantean Worm rewards an Atlantean Worm Heart, which permanently grants 100 max health on first use.