As an action, a creature that you can touch or see within 18 meters and that can hear you must make a Will saving throw, and it does so with advantage if you or your companions are fighting it.
On a failed save, the creature is charmed by you for the duration. While charmed the target regards you as a trusted friend to be heeded and protected. Although the target isn’t under your control, it takes your requests or actions in the most favorable way it can.
The effect ends if you or your companions do anything harmful to it, you die, a remove curse spell is cast on it, the charmed condition is removed from it, you use this spell again, you choose to end the effect, or you are on a different plane of existence than the target.