Corebook p. 239
Upon breaking a Conviction or a Chronicle Tenet, you will incur Stains. The character will then roll Remorse to determine whether they drop in Humanity.
Rolling Remorse: count your unmarked Humanity dots on the tracker (ie. empty boxes, those with no Humanity dots or Stains). Roll that amount of dice (with no Hunger). At least one success means a successful Remorse roll, and your character retains their Humanity. A total failure means your character drops 1 point of Humanity.
On server: If you incurred Stains during your week of play, you roll Remorse after reset, just after your Wake Up Rouse Check.