Mother Smolderweb

Mother Smolderweb is a level 60 elite crystal spider mini-boss found in Lower Blackrock Spire. She is notable for having been a quest objective, and currently as the guaranteed source of the Smolderweb Hatchling companion.

Dungeon Journal
''Centuries ago, the Dark Iron dwarves dug into the lair of Mother Smolderweb, releasing the massive arachnid into the spire's halls. Her brood has continued to swell in number since that time, so much so that even Blackhand's forces fear traveling through Smolderweb's domain.''