The Strongbox is an item found in a cave north of Lakanaba by Torneko Taloon. This item acts as a portable bank and stops monsters from taking half of your money when the party is wiped out.

After hearing rumours of the Strongbox from the Inkeeper at Lakanaba, Torneko sets out to the north and enters the cave. Fighting through the monsters that reside there, he continues on and finds the Strongbox.