Spider
This NPC can be found in Ghostlands (19), Naxxramas (36), Ahn'kahet: The Old Kingdom (16), Howling Fjord (15), Pit of Saron (12), Utgarde Pinnacle (12), Utgarde Keep (9), Drak'Tharon Keep (13), The Forge of Souls (5), Violet Hold (4), Azjol-Nerub (8), Icecrown Citadel (22) and Halls of Reflection (3).