Mergo's Wet Nurse Location
Boss · Bloodborne

Mergo’s Wet Nurse waits at the top of the Nightmare of Mensis. After victory, use the new lamp to return to the Dream, where Gehrman offers an ending choice. Position is approximate.
How to get to Mergo's Wet Nurse
Mergo's Wet Nurse is in Nightmare of Mensis · Wet Nurse's Lunarium. On this map the route to it starts from the Mergo's Loft: Middle lamp.
Areas to pass through on this map, starting from Central Yharnam:
- Central Yharnam → Cathedral Ward (Locked passage: Oedon Tomb Key gate: to the Cathedral Ward; Requires: Oedon Tomb Key)
- Cathedral Ward → Lecture Building (Warp: Lesser Amygdala (Tonsil Stone): to the Lecture Building; Requires: Tonsil Stone · residential window)
- Lecture Building → Nightmare of Mensis (Warp: 2F door to Nightmare of Mensis; Requires: The One Reborn)