Stony Tark <Trials and Challenges>
This NPC can be found in Dalaran (1), Teldrassil (1), Elwynn Forest (1), Dun Morogh (1), Azuremyst Isle (1), Stranglethorn Vale (1), Durotar (1), Eversong Woods (1), Mulgore (1), Tirisfal Glades (1), Stormwind City (1) and Orgrimmar (1).