Hi Radio thank you for the question! Pathos will fade between sessions as it usually does in the base rulebook. Fueling the abilities for Guilt to be stronger is more of a secondary as opposed to primary tools. If you’re succeeding in all of your rolls, no pathos acrues and youre doing well. If you fail rolls, continuously get hurt, etc, your abilities now can be stronger/unlocked which is sort of the design philosophy behind it. However honestly if an admin and player decide together to have pathos exists between sessions for a Guilt User, who am I to say no? Do whatever feels right for your table and the rhythm of your missions/sessions.