Empathy

You touch the forehead of a willing, living creature. All of their memories are near-instantaneously absorbed into your mind. You must make a Wisdom saving throw, which has a DC equal to half of the targets age. On a successful save, you are unable to take actions or bonus actions on their next turn. On a failed save, you take 6d6 psychic damage and suffer from psychic backlash for 1dX hours, with X being equal to the targets age in decades, rounded down. While under the effects of psychic backlash, you can't take actions or bonus actions, can't understand what other creatures say, can't read, and can’t speak. A greater restoration spell cast on you ends this effect.

With another persons memories in their mind, your character has essentially lived two different lives, potentially with very different morals, values, and experiences. Work with your DM to determine the possible side-effects of casting this spell.