The summoned merchant will follow you from a distance. This merchant has every item a normal merchant carries.
If the ally dies, another player can summon a new one before the first player's has recharged.
This item is not usable in Solo Quests, including Dwarven Boxing and Bonus Mission Pack missions.
This item can be useful while caravan vanquishing, as the player is able to sell their loot to free up some inventory spaces, since most explorable areas rarely have a merchant present (particularly in Prophecies). Additionally, this item is also useful for farming purposes to get rid of the player's "junk".