Gossamer Oath

Level 1 Enchantment (Bard, Druid, Sorcerer, Warlock, Wizard)
  Casting Time: 1 Action
Range: 30 feet
Components: S, V
Duration: 24 hours

  Choose one creature you can see within range that can understand you. You state a simple condition for the target’s behavior, such as “Do not harm this person,” “Do not reveal this secret,” or “Do not flee this battle.” The target must make a Wisdom saving throw. It does so with Advantage if you or your allies are fighting it. On a failed save, the target is Charmed by you for the spell’s duration and is bound by the stated condition for as long as the spell lasts. While so bound, the creature remains aware of the condition and of the magic enforcing it.
  If the target knowingly and willingly breaks the condition, the spell ends immediately, the target takes 3d6 Psychic damage and cannot take Reactions until the end of its next turn.
  On a successful save, the target takes half as much damage but is not Charmed, and the target is aware that you attempted to bind it with a magical oath.
  Using Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 1.