I figure when we're at a breaking point in the narrative we can actually use XP to 'move towards perfection' which you need to do four times before you make the next tier, if you're using a short term or long term expenditure of XP I guess that could be anytime in story.
Also p.12 of the Player's Guide lets you know what you can buy for 4 XP.
Last edited January 25, 2016 5:38 pm