greet trader
The round little man smiles broadly at you, and says:

"Greetings, fine fellow! And welcome to Trader Tull's, the place to go when
 satisfaction needs to be guaranteed! Although my selection of objects to
 trade is somewhat small right now, who knows what the future may hold! Is 
 there anything you cannot use right now, or do not want, that you would like
 to trade in for something more to your liking?

ask trader trade

"Well," he rambles, "I will accept a trade of any of the following items, but I
 can only trade certain things back in return. Please note that if you have any
 objects that you aren't powerful enough to use, this would be a great time to
 trade them in!"

 You can trade...

 a Fine Breastplate (L10) for Silvery Plate Armour and 1,500 gold.
 a Runed Chainmail Tunic (L10) for a Fine Chainmail Tunic and 1,000 gold.
 a Wyvernhide Tunic (L20) for an Ogre-Skin Shirt (L10) and 4,500 gold OR
                          for a Gianthair Vest and 5,000 gold.
 some Runed Robes (L10) for Gilded Robes and 2,750 gold.
 a Glowing Warhammer (L10) for a Fine Mace and 500 gold.
 a Glowing Broadsword (L10) for a Fine Broadsword and 500 gold.
 a Bladed Staff (L15) for a Black Steel Halberd (L10) and 2,000 gold OR
                      for a Fine Greatsword and 2,500 gold.
 an Elven War-Spear (L20) for a Bladed Staff (L15) and 4,000 gold OR
                          for a Black Steel Halberd (L10) and 5,000 gold OR
                          for a Fine Greatsword and 5,500 gold.

If an item has a (L10) beside it, that means it can only be used by a level 10
character. L20 means Level 20, and so on.

Type trade <item you have> for <item you want> to make a trade. 
Example: trade runed chainmail tunic for fine chainmail tunic