Sister Reverence was a Forkrul Assail Pure, one of the Lawful Inquisitors.[1]
She was the eldest of the Assail near the Great Spire. She was described as tall even for her race and "exceedingly gaunt, almost skeletal" with sickly grey skin which looked bruised around her joints.
She was thousands of years old and over those many years had accumulated some physical ailments: a missing eye with a collapsed brow ridge on the same side as the result of a Jaghut tusk slash, and an obvious limp as a result of a T'lan Imass sword injury to her left hip.
In The Crippled God
During the final battle at the Spire she guarded the heart of the Crippled God. She fought and killed Gesler just before Hood slew her.