ROTMG The Lab Key x8
The Lab Key open Mad Lab dungeon.
The Mad Lab is a medium-high level dungeon that is a source of Potions of Wisdom, Potions of Defense, and the Mad Scientist Sorcerer UT set.
This dungeon is intended for high-level players (Suggested Level: 20) because the enemies and bosses can do significant damage.
Entrances to the Mad Lab are uncommonly dropped from Flying Brains.