The Armoire of invincibility is a mystical item that Fighter was questing for, for about 3 days. For a short time Fighter carried this item until Red Mage used the hyper cube to store it. It was eventually used to kill Vilbert Van Vampire. It is also really really heavy, and the bottom is cheap partical board.
"Vilbert was impalled with the Armoire of invincibilty"
by Aerozord April 24, 2004