16
When you try to remember something that happened before, roll.
On a 10+, you remember. This is not always better.
On a 7-9, you remember the light. The rest assembles itself around the light and some of it is wrong and you will not know which parts.
On a miss, you remember something that happened to someone else. You have been carrying it so long it has your fingerprints on it now. It is yours. The GM will not tell you where it came from.