

Additionally, the player gains the ability to open Lab Chests with a Keycard Dropped from Moon Lord. The rest of the Abandoned Lab becomes accessible after the player has crafted at least one of the Luminite Pickaxes, or by means getting the Laser Drill which have sufficient pickaxe power to break the Dark Sludge Blocks blocking access to the rest of the Lab, recommended to be explored post Moon Lord. After Golem is defeated, the player gains the ability to mine Uranium, allowing access to materials crafted by said material. Each mini boss drops a Lab Access Panel, which deactivates the laser security systems to unlock additional sectors of the Lab. Following the defeat of the Mechanical Bosses, the drones will be deactivated, allowing access to a portion of the Lab, including the rooms containing The Janitor, Stage 3 Infected Scientist, and Irradiated Behemoth mini bosses, as well as a number of items from Petrified Wood Chests. The Abandoned Lab can only be initially visited in Hardmode, after the player has defeated all three Mechanical Bosses attempting to visit the Lab prior will unleash invincible Laboratory Drones that will relentlessly attack the player. It's recommended to acquire the IO-Locator accessory and equip it before trying to find the lab.

The Abandoned Lab will always be generated at the same location, depending on map size: With its dangerous defenses and debuffs, the player must exercise caution prior to entering. Unlike other areas in Terraria, the Abandoned Lab has a static structure of similar size to the Jungle Temple, and will always be the same in all worlds. The Abandoned Lab, known in the mod's lore as Teochrome Research Laboratory, is a massive underground dungeon that generates upon world generation. The white path is accessible post- Mechanical Bosses, and red path is accessible post- Moon Lord.

Map view of the Abandoned Lab, along with the direct path to the end (click to enlarge).
