Ancient Altar (Balthazar)
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Not to be confused with Ancient Altar (Shar)
Ancient Altar is a kind of environmental object in Baldur's Gate 3. It is used to access a secret room inside Moonrise Towers.
Involvement edit
The Ancient Altar can be found inside 
Balthazar's chambers, which is located in Moonrise Towers. Interacting with the bookshelf labelled "Musty Tomes" inside the chambers highlights the altar and makes it interactive.
Inserting a 
Heart into the altar unlocks Balthazar's secret room behind the bookcase. Several hearts lie around the room. However, various other body part items found throughout the game also suffice, including the heads of 
Nere and 
Karlach, as well as the hand of 
Gale.
