Found Indiana Jones' Legacy

From the bottom of the staircase in the False Temple go, open the door and go south into a well kept living quarters, killing the dark elf who lives there. The clue here is in the long description of the room.

Go east into the dark twisting corridors. There are no obvious exits here so finding your way around is a mater of trail and error. Go until you reach the throne of bones, dealing with any skeletons on the way. Now go where you will be before a stone pedestal. type to examine it.

The bag is guarded by a will-o-wisp, so quickly dispatch it and grab the bag, by typing, to complete the quest.