In The Rise of Skywalker,
Rey impales Kylo through the abdomen with his lightsaber at the end of their duel in Endor. This is certainly a mortal wound, but Rey then heals Kylo with little exertion and Kylo appears to be no worse for wear afterwards as he is able to immediately rush to Exagol and defeat the Knights of Ren in combat with little trouble.
Then, at the end of the movie
after Rey dies, Kylo brings her back to life by exchanging his own life for hers.
Are they only able to perform these feats due to their unique status as
a dyad in the Force?
It seems like an extraordinarily powerful ability that even the strongest Jedi and Sith masters of the past have never been able to do.