Before the events of Diablo, Wirt and many other children from Tristram were abducted and tortured by the Fallen Ones. Wirt was the sole survivor, rescued by Griswold from the clutches of the Butcher , but at the cost of his leg. Replaced by a peg-leg, Wirt set up shop on the outskirts of town, where he peddled his wares with his trademark phrase, "Psst! Over here!". He only sold a single item at a time, and even charged a 50 gold fee just to see it. His item was generally better than any other sold in town however, but was sold at outrageous prices. He claims to be saving his gold so he can escape Tristram, and hopes to take his crush Gillian with him.
His prosperity would be short lived, however. It is revealed in Diablo II that he fell victim with the rest of the town when Tristam is destroyed. His body is found near the spot where he sold his wares, complete with a nice haul of gold and his peg leg, which can be used as a weapon and serves as one of the items needed to access the Secret Cow Level.
In Diablo III, Wirt is referenced in the form of "Wirt's Bell", which can be purchased from Squirt the Peddler for 100,000 gold.
- Adria truly bothers me. Sure, Cain is creepy in what he can tell you about the past, but that witch can see into your past. She always has some way to get whatever she needs, too. Adria gets her hands on more merchandise than I've seen pass through the gates of the King's Bazaar during High Festival.
- As long as you don't need anything reattached, old Pepin is as good as they come.
- Cain knows too much. He scares the life out of me - even more than that woman across the river. He keeps telling me about how lucky I am to be alive, and how my story is foretold in legend. I think he's off his crock.
- Don't trust everything the drunk says. Too many ales have fogged his vision and his good sense.
- Farnham - now there is a man with serious problems, and I know all about how serious problems can be. He trusted too much in the integrity of one man, and Lazarus led him into the very jaws of death. Oh, I know what it's like down there, so don't even start telling me about your plans to destroy the evil that dwells in that Labyrinth. Just watch your legs...
- I guess I owe the blacksmith my life - what there is of it. Sure, Griswold offered me an apprenticeship at the smithy, and he is a nice enough guy, but I'll never get enough money to... well, let's just say that I have definite plans that require a large amount of gold.
- If I were a few years older, I would shower her with whatever riches I could muster, and let me assure you I can get my hands on some very nice stuff. Gillian is a beautiful girl who should get out of Tristram as soon as it is safe. Hmmm... maybe I'll take her with me when I go...
- If I'd have had some of those potions he brews, I might still have my leg...
- In case you haven't noticed, I don't buy anything from Tristram. I am an importer of quality goods. If you want to peddle junk, you'll have to see Griswold, Pepin or that witch, Adria. I'm sure that they will snap up whatever you can bring them...
- Not everyone in Tristram has a use - or a market - for everything you will find in the labyrinth. Not even me, as hard as that is to believe.
- Ogden is a fool for staying here. I could get him out of town for a very reasonable price, but he insists on trying to make a go of it with that stupid tavern. I guess at the least he gives Gillian a place to work, and his wife Garda does make a superb Shepherd's pie...
- Sometimes, only you will be able to find a purpose for some things.
In Warcraft 3: The Frozen Throne there is an item named Wirt's Other Leg. With a description:
"Perhaps the overzealous adventurer pried this off before his journey here thinking it might give him one last opportunity at bovine slaughter. Little did he know where it would lead him."
It is guarded by a mob named Butcher, and can be found in Lord of Outland mission.
In World of Warcraft, there is an item named Wirt's Third Leg. It drops in Tanaris from Captain's Chest or Pirate's Footlocker. It's Bind on Pickup one-handed mace, with the damage of 49-92.
In Hellgate: London, there is a character named Li'l Joey who will change his name into Wart after completing a quest for him, where you recover his prosthetic leg. The player is then awarded with Wart's Peg Leg. He also mention that he usually charges 50 palladium from people to give them information.