1. You must move the sword from your inventory to the stone (stand next to the stone) after you've defeated the ghost.
2. Have you talked with the boss of the merchant guild (I think you must be a member of the guild before you can open the door to the room, from where you can enter the basement)?
Then you must take the 4 keys (they are in the desk next to the door).
![[Linked Image]](http://dl666.bei.t-online.de/divinity/merchant_guild.jpg)
P.S. Not everybody can help you with these problems.
btw: The title of this threads is not very meaningful.