Gaunter O'Dimm

"You are primitive. You think you’ve defeated me but you are wrong. I can’t be killed, I will be back."

- Gaunter O'Dimm Gaunter O'Dimm, also known as Master Mirror or The Man of Glass, is a character from The Witcher 3: Wild Hunt. In the game, he originally appears as a minor character; he later becomes the main antagonist of the expansion pack, Hearts of Stone. Upon his first meeting, O'Dimm presents himself as a former merchant of mirrors, now turned vagrant. In the DLC, however, it turns out that he is a mysterious, ancient being who has been making deals and collecting human souls for millenia. He is present in many cultures under many names, although the most common seems to be "Evil Incarnate".

The Witcher 3: Wild Hunt
During one of the quests, O'Dimm can be seen in the White Orchard Inn. He provides the main character, Geralt, with information that he needs, but asking nothing in return. He states that 'maybe one day [he] will be in trouble ' and Geralt will just happen to be nearby. After leaving his table, he immediately disappears.

Hearts of Stone Expansion
When Geralt is held captive on a ship, O'Dimm suddenly appears next to him. He offers the witcher a deal; he will set him free, in exchange for a favour. After Geralt agrees, O'Dimm burns a mark on his face as a sign of contract, then disappears. He then conjures up a storm, which destroys the ship and gives Geralt a chance to escape.

After Geralt meets him at the crossroads, O'Dimm tells him a story of Olgierd von Everec (whom Geralt has previously met, and that led him to being captured). It turns out that von Everec also made a deal with Master Mirror, but has been avoiding to fulfil his end of the agreement. The contract states that before collecting his payment, O'Dimm must grant the nobleman three wishes, either by himself or through a proxy. He tells Geralt that if the witcher fulfils von Everec's wishes, his own debt is paid. Reluctantly, Geralt agrees.

Trivia

 * The characters of O'Dimm and von Everec, and their story, is heavily influenced by the Polish legend of Master Twardowski - a nobleman, who sold his sould to the devil in exchange for magical powers. Their contract stated that Twardowski's soul could be taken from him only when he and the devil (Mephistopheles) meet in Rome. After many years, they finally meet in an inn called Rome, but Twardowski uses his magic to escape the devil and live on the Moon.
 * Another possible inspiration for O'Dimm is Stephen King's Needful Things.
 * Gaunter O'Dimm's acronym is G.O.D.