Bodyguard

You are a valiant protector of your allies, if you are able to move, and an ally within 10ft receives an attack that targets only them, you may move the intended target 5 ft directly away from the attacker, take his place and receive all attacks as if you were the intended target. If the attacker has multiple attacks, he must use them on you, or forfeit those attacks that turn

This will not work if you are restrained, or under any effect that would affect your movement.

If you are on or would have to move into difficult terrain, the range reduces to 5 ft