The Players are required to track the number of gaming sessions for a specific campaign. Each session is worth at least one Attendance Mark. Attendance for less than a full session may be given credit, at GM discretion. Once used for any reason (the GM determines their use), these marks are permanently gone.
i20 [specific] Requirements:
Level Up Limits: This solidifies the Milestone advancement to attendance based approach; By default it takes 3 Attendance Marks x the Character Level to be gained to acquire a new level.