Crimson Key

The  is a key that the player can obtain in Hard Mode, which unlocks the Crimson Chest.

The above video is no longer the most efficient method possible. It is more efficient to use turtle armor to kill the meteor heads as there is absolutely 0% item loss. Standing in honey will regen your health and remove the burning from the meteors. The above method may result in a loss of keys; whereas, this method has 100% pickup rate. A regen band and campfire help as well. This method was discovered by Lanfear. http://cloud-2.steampowered.com/ugc/903261352769517290/1457AA1486A4EE98550B447DD221E6A6B103958E/