Crystalline Mind

Your mind is exceptional, granting near-perfect recall of events, books and experiences.  However, your sense of self and interpersonal skills can suffer as a result.

• Increase your Intelligence score by 1, to a maximum of 20.
• Decrease your Charisma score by 1.
• You can recall any event you have experienced with uncanny detail (applies only to events taking place after you take this feat).
• You may make an Investigation or Insight check with respect to an event you recall.  This check takes ten minutes, you have disadvantage on this check, and the expertise bonus from this feat does not apply.  You may not use this ability again until you complete a short rest.
• You gain expertise on any check which is significantly reliant on memory, if you already have proficiency for that check.  Otherwise you gain proficiency for that check.  (for example, an Investigation check to notice that a chair has been moved since you were in a room, a History check to remember the name of Vecna's generals, or an Insight check to identify someone disguised as a person you have previously met; but not a Medicine check to stabilise a companion, or a Religion check to correctly perform a prayer service).
• This feat does not affect learning spells or rituals.