Cave of the Unknown

In a currently unknown location, a strange cave is currently quiet. In this cave a golden sword embedded in a hand-shaped rock like Ex Caliber waits. Legend says that great power comes to whoever can withdraw this sword. However, the key  to withdrawing the sword is in one of six bottles for it contains the secret to gaining the sword. But which bottle is the right bottle?  Those who find the cave can only choose one bottle and must take it out of the cave before opening it. Once a bottle is taken out of the cave, another appears to take its place. but what wonders or dangers await those who enter this cave. That's the true mystery.