Spider
This NPC can be found in Ghostlands (19), Utgarde Pinnacle (9), Utgarde Keep (7), Howling Fjord (4), Grizzly Hills (11), Icecrown Citadel (5), Azjol-Nerub (5), Drak'Tharon Keep (7), Naxxramas (16), Ahn'kahet: The Old Kingdom (16), The Culling of Stratholme (7), Violet Hold (4), The Forge of Souls (5), Pit of Saron (12) and Halls of Reflection (3).