Hi !
If you have the latest version of DOL, the buff merchant is implemented.
You will have to do /mob create DOL.GS.BuffMerchant ingame
To add the npcs do it like this :
Find lines like this :
namespace
DOL.GS
{
public class
BuffMerchant : GameMerchant
When you found it : use the /mob create command.
--> /mob create
DOL.GS.BuffMerchant
To add the buffs token do :
--> /merchant sell add BuffTokens