It used to open every door in Tibia. However, that is not the case anymore. Shapeshifter was the owner of this key and many other unique keys. Since Shapeshifter was hacked, his key collection (including key 0000) was lost. Other collectors have tracked down the hacker and bought the key collection to preserve its history and did so successfully. This key was added into the game by one of the map creators (before CipSoft became a big company they used volunteers to do areas). This person added the key into the game in secret. When CipSoft found out that there was a hidden key, they removed its function.The old master key was wooden (brown) and the new one is magical (purple).Source: https://tibia.fandom.com/wiki/Key_0000
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