This cheat is used in conjunction with the "Free Experience" cheat involving Batlin.

Once you have enabled that cheat, open a character's inventory and pick any item that has a quantity -- gold, arrows, reagents, etc. The item has to pull up the 'quantity' check-box when you move it. Put this item on the ground, and select the entire quantity.

Once you've done that, talk to Batlin. When you accept the mission, not only will everyone get another 100 Experience, but the item that you dropped on the ground will be duplicated in your inventory with the same quantity.

(Example: Put 100 gold pieces in the Avatar's hand, then put them on the floor. Talk to Batlin, and the Avatar will have another 100 gold pieces in his hand.)

This cheat will work with ANY item that has a quantity (i.e., it shows a number when you click on it). I'd recommend putting a few barrels on the flying carpet so you can haul around all the gold, arrows, and what-not you stock up.