Sister Calm was a Forkrul Assail Pure, one of the "Lawful Inquisitors". She is described as having "skin like polished marble, devoid of flaws, a broad brow over enormous midnight eyes that seemed dry and flat, like onyx beneath a layer of dust". She also had "high, flaring cheekbones, a wide mouth". She is also described as "a thing of hairless pate, skin the hue of bleached papyrus, elongated limbs that moved with uncanny grace".
She had been imprisoned beneath a boulder for thousands of years. When Karsa Orlong stumbled across the imprisoned Assail, he chose to help her escape from her captivity. He and and Bairoth Gild wanted to free her, but Delum Thord had serious doubts. After some discussion, it was agreed that the three would free the "demon". As Calm was released, she lunged at Karsa and knocked him to the ground. Delum Thord reached for his weapons, an act which Calm took as a threat causing her to throw him some distance with a swipe of her powerful hand, and subsequently escaped. This one blow caused major brain damage to Delum Thord.
Calm collected the bones of her ancestors and with them chained the unconscious Icarium in the old lands of the Elan, with the intention either of using his power or killing him, depending on the outcome of her ambitions. It was revealed that she was one of the Pures in Kolanse, but unbeknownst to her fellow Forkrul Assail, she was working with the Elder Gods, Sechul Lath, Errastas and Kilmandaros.