Instinct

Every playbook comes with a short menu of Instinct options — single-word compulsions, like Violence, Pride, and Recklessness for The Heavy, or Curiosity, Hubris, and Vision for The Seeker. Pick one during chargen: it's the drive your PC leans toward, or fights against, under pressure.

Instinct isn't scenery. When your PC engages with it — playing it straight or visibly struggling against it — mark XP at the End of Session move, alongside the relationship-shift XP. It's one of the two personal prompts that move asks every session, so an instinct that never comes up in play is XP left on the table.