Elder Brain Blood
is a quest item needed Baldur's Gate II: Shadows of Amn
and Baldur's Gate II: Enhanced Edition
during chapter 4
. The Matron Mother needs this, or Kuo-toa's Blood
or the eye of an Elder Beholder for the ritual. It can be acquired from the Elder Brain
, which can be found in the Mind Flayer Dungeon which can be entered from the eastern part in the Underdark area.
|| This is the blood of an Elder Brain. Squishy brain matter floats in the dark bloody substance.