Merchant's Eye

Ability Score Increase. Increase your Intelligence or Wisdom score by 1, to a maximum of 20.

Tactical Analysis. As a Bonus Action, you can take the Study action to examine a creature you can see within 30 feet of you. Make an Intelligence (Investigation) or Wisdom (Insight) check against a DC equal to 10 + the creature’s Charisma (Deception) modifier. On a successful check, you learn whether the creature has any damage Vulnerabilities, Resistances, or Immunities, and what they are. Additionally, for the next minute, your attack rolls against that creature score a critical hit on a roll of 19 or 20 on the d20. You can use this Bonus Action a number of times equal to your Proficiency Bonus, and you regain all expended uses when you finish a Long Rest.