Psychologist (5e Feat)

This features helps you tear people apart from inside the mind or help heal any trauma they may have. You gain the following benefits:

Whenever you make a Wisdom (Medicine) check to diagnose a mental illness or madness, you are considered proficient in the Medicine skill and add double your proficiency bonus to the check, instead of your normal proficiency bonus.
You have advantage on Intelligence (Investigation) or Wisdom (Perception) checks to discern illusions.
If you spend at least 10 minutes observing or interacting with a creature with which you share a language, you have advantage on Wisdom (Insight) and Charisma (Persuasion) checks made towards them.