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Faryn is a salesman of so-called "previously owned" goods. He can be found outside the entrance to Orzammar in the Frostback Mountains.
Background
Faryn sells mostly weapons and armor, although he does stock several other types of items, as well, particularly crafting materials. He sells some recipes and a Remarkable Topaz as well.
Involvement
Faryn is a key part of the Sten's Lost Sword quest. He found it presumably amongst the remains of Sten's fellow Qunari soldiers near Lake Calenhad, then sold the plot of land to another scavenger. The sword, Asala, was then purchased by Dwyn of Redcliffe.