The Brood Mother

The Brood Mother is an event that can be found in the Caverns of Luray level 2 in in Diablo III, within The Paths of The Drowned. The event does not show up as a bounty in Adventure Mode, and can only be done in Campaign Mode. Completing the event is one of the requirements for The Bog Slog achievement.

The brood mother will be present in the dungeon when Decaying Boggits are present on both levels. If you see skeletons on the floor in the Caverns of Luray level 1 or 2 make a new game and search again for a new caverns.