Sin's physical form, as described in Calm Silence.
Sin is one of several Emotions that resides in the Calm Silence. An androgynous being, Sin appears in both Calm Silence and I Think, Therefore We Are.
Sin tempts Lady Shalice with thoughts of fulfilling her own desires instead of completing her quest of finding a new Home for her people.
After being pulled from the hilt by Harland's insatiable desire for power, Sin appears to face Shalice Kismet and Mic Sanguine in a big showdown.