Spider
This NPC can be found in Eastern Plaguelands (30), Zul'Aman (15), Gilneas (13), The Hinterlands (12), Winterspring (10), Ahn'kahet: The Old Kingdom (8), Drak'Tharon Keep (7), Teldrassil (7), Utgarde Pinnacle (6), Sethekk Halls (5), The Culling of Stratholme (5), Dustwallow Marsh (3), Icecrown Citadel (3), Black Temple (2), Elwynn Forest (2), Pit of Saron (2), Azshara, Gilneas City, Hillsbrad Foothills and Mana-Tombs.
