A potion that can be bought for 300 in-game dollars, You can also use gold to purchase it.
Unlocks the crawler as a playable character.
-Current known facts-Edit
The player can hide by pressing the sprint key.
The player has a very high jump height, But can still take fall damage.
The unlock is removed if you die. (As a personal fact, I died 2 times with it and got one more try.)