The vendor is an in game shop where you can sell your items for a static amount, compared to the Marketplace where you can sell to players for as much as you'd like.
All items and their vendor value can be found on the Items Database
Commands[edit | edit source]
!value [item name] Tells you how much the item will sell for if you !vendor it.
!vendor [item name] [amount optional] Sells the item to the vendor. Items sold to the vendor cannot be recovered once sold.