The Kaer Morhen Laboratory is a dark, vaulted stone chamber hidden deep within the lowest foundations of the witcher keep. This highly secretive space is the emotional and functional centerpiece for ‘The Battle of Kaer Morhen’ and ‘The Trial of the Grasses’ questlines. The room is filled with ancient alchemical alembics, iron restraining chairs, and dusty lore books, functioning as the brutal site where mutant decoctions are brewed and where Yennefer attempts to lift the curse from the creature Uma.