Andrus was a Keeper around the time of the Catastrophe. When Keeper Lukas showed some fears of what was going on in the Old Quarter and the Sealing of the Haunted Catherdral, Keeper Andrus sent a letter to help quell some of his doubts[1] and explain why the Keepers felt they had to involve themselves directly in affairs.
Keeper Lukas wrote a letter to Andrus saying he was glad that the Elemental Wards were saved for just such a reason and to hide the Talismans well. He also feared that act of interference might have exposed the truth about the existence of the Keepers.[2].