Needed, little bit of adena (500 will do)
Go to a magic shop that works buy the most expensive stackable item they sell there, buy 100 million of the item at a time, u'll see it costs a lot (don't press ok yet)
Add 100 million again, by now the number should be negative...
Keep adding and removing items till it costs what u can afford, press ok, sell items to the shop, voila, lotsa adena...
I don't tested it...so i'm not sure if work.
^AzK^
Credits to Cerlis