Abandoned Laboratory

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The Abandoned Laboratory is a massive underground dungeon that generates upon world creation. Unlike other areas in Terraria, the Abandoned Laboratory has a static structure and will always be the same in all worlds. With its dangerous defenses and debuffs, the player must exercise caution prior to entering.

The Abandoned Laboratory will always be generated at the same location, depending on map size:

Map Size Lateral Position Depth
Small 600' East 824' Underground
Medium 820' East 1244' Underground
Large 1020' East 1904' Underground

It is recommended to acquire the Outbreak Locator accessory and equip it before trying to find the laboratory.

The Abandoned Laboratory can only be initially visited in Hardmode, after the player has defeated all three Mechanical Bosses; attempting to visit the Laboratory prior will unleash invincible Laboratory Drones that will relentlessly attack the player. Following the defeat of the Mechanical Bosses, the drones will be deactivated, allowing access to a portion of the Laboratory, including the rooms containing The Janitor and Irradiated Behemoth mini bosses, as well as a number of items from Standard Security Lockers. Each mini boss drops a Lab Access Panel, which deactivates the laser security systems to unlock additional sectors of the Laboratory.

The rest of the Abandoned Laboratory becomes accessible after the player has killed Moon Lord and obtained the Keycard to open the Locked Keycard Doors around the laboratory, as well as the ability to open High Security Laboratory Crates. Before Blisterface, the player will have to craft the HEV Suit to survive the Radiation and will have to navigate the underwater maze to proceed to Blisterface. After defeating Blisterface, the player will be rewarded with the Nano Pickaxe, which can break Black Hardened Sludge, allowing complete access to the Abandoned Laboratory, including the Protector Volt and MACE Project mini bosses and the final boss of the dungeon: Patient Zero.

The water in the Abandoned Laboratory has a Wasteland Watertoxic green color and will deal 30 damage per second to any players submerged in it without proper protection.

After Irradiated Behemoth, the player will be able to resummon the laboratory mini bosses by using the Hologram Remote, which is sold by The Janitor.

Contents

Characters
Before defeating all Mechanical bosses:
After defeating all Mechanical bosses:
After obtaining the Dead Ringer:
After defeating The Janitor:
After defeating Protector Volt:
Unique Drops
From Blistered Scientists, Bloated Scientists, and Oozing Scientists:
From The Janitor:
From Irradiated Behemoth:
From Blisterface:
From Protector Volt:
From MACE Project:
From Patient Zero:
Environment
Unique Treasures
From Laboratory Cabinets:
From Standard Security Lockers:
From High Security Laboratory Crates:
From the Special Laboratory Crate after Blisterface:
From the Special Laboratory Crate after Patient Zero:

Notes

  • Rod of Discord and Rod of Harmony will not work within the Laboratory until Patient Zero is defeated.
  • While in the Abandoned Laboratory, the player will be immune to the Shimmering debuff.
  • Enemies that spawn in the Laboratory never despawn naturally unless the player exits the biome.

Trivia

Gallery

  • Bestiary and Map Background.
    Bestiary and Map Background.
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Biomes and Structures
 
Biomes Wasteland
Cavern • Desert • Forest • Jungle • Ocean • Snow • Space • The Hallow • The Underworld
Structures Abandoned Laboratory • Ancient Hut • Blazing Bastion • Crashed Ship • Golden Gateway • Hall of Heroes • Nature Shrine • Portals (Surface • Underground) • Tombs (Gathic • Frozen Gathic • Spirit)
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