Characters may spend XP during downtime, when they are not involved in any scenes.
The following is the cost matrix for purchasing character traits:
|Primary attribute||Level purchasing x10|
|Secondary attribute||Modifier level x3|
|Skill||Level buying x2|
|Advantage||Book cost x1|
|Buying off a disadvantage||Book cost x1|
|Balanced trait||Level buying/paying off x1|
|Power||Level buying x5|
In all cases, characters must justify their XP expenditures in one way or another. Someone seeking to increase their strength should spend time in a gym. Someone trying to learn a new spell should do research. Such tasks are usually suited to downtime and may be worthy of a "completed goal" if role-played satisfactorily.