Dragon Age: Origins Edit
Vartag can be found in the Chamber of the Assembly in the Diamond Quarter. He will offer a task to enable the Warden to prove their loyalty. After completing it, he will bring the Warden to meet Prince Bhelen.
If the Warden is of the Dwarf Noble Origin, Vartag will be suspicious about offering support to Bhelen and has to be persuaded (Improved Coercion is needed) in order to believe that the Warden's intentions are genuine. If the Warden is of Dwarf Commoner Origin, their half-sister Rica Brosca can introduce them to Vartag.
If the Warden chooses to support Lord Harrowmont over Bhelen, he remains at the palace after the coronation and will attack the next time he is conversed, assisted by some royal guards.If Bhelen is chosen to be the king and the Warden makes the ultimate sacrifice in the end, Vartag appears at the Warden's funeral, presumably as the official representative of the King of Orzammar.
Dragon Age: Inquisition Edit
If Bhelen was made King, Vartag Gavorn will continue to serve as his second by 9:41 Dragon.Ordel of the mining caste will attempt to contact him about the unnatural earthquakes occurring in the Storm Coast demanding immediate assistance citing the fact that lyrium mines are critical for Orzammar's economy. However the letter is not sent and is found next to a corpse.
You can steal a Champion's Shield from Vartag, up to three times. Once when you first talk to him to get the quest to help Prince Bhelen at the Chamber Assembly, the second can be obtained if you complete the proving fights causing him to show up at the Proving Arena, and the third time after you've finished the quest and in the Royal Palace.