downtime downtime downtime -- especially the relationship between downtime, stress, "vice," & trauma. those mechanics are SO so good at developing character, at giving space for arcs to grow and develop, and for providing mechanics for character change that i've seriously considered hacking stress back into a pbta game where pushing yourself gives you a +1 to a 2d6 roll or something. crews are also a really big one because i think they let you paint with a really broad brush, and i like position/impact a lot too.