Brother Obscura was the christian monk, and a leader of Lux Veritatis. He imprisoned the alchemist Pieter Van Eckhardt under Lux Veritatis headquarters, Castle Kreigler. He then over painted Eckhardt's Obscura Paintings with religious imagery and hid them across Europe.
When he died, he was buried with one of the Obscura Paintings in The Hall of Seasons.
In 2003, Lara Croft found her way to the Brother Obscura's tomb, which led for Brother Obscura's spirit to awaken. He tried to stop Lara from taking the Obscura Painting, but failed. After Lara left, Brother Obscura couldn't follow her, since he was bound to that room.