Twin

Born within minutes of your sibling, you share a special bond that borders on magical. If your twin sibling takes this feat as well, you both gain the following benefits:

You and your twin share a language of your own invention, which other creatures cannot understand without magical means. You can communicate either verbally or through gestures, as long as you can see or hear each other.

When your twin is within 15 feet of you and you can see them, you have Advantage when making saving throws against becoming frightened.

You cannot be surprised at the start of combat if your twin is in the same combat encounter and is not surprised.

You have spent a lifetime with your twin and know all of their tells. You have Advantage when rolling an Insight check against your twin.

You immediately know if your twin is reduced to 0 hit points, regardless of the distance between you.