Help with a Feat

My character died protecting one person really important to she, now I'm playing as this person and the dm make that the spirit of the dead character is bonden to the new one. We got level 8 just as she die and my Dm say that if I have a creative idea of a feat I can probably get it, I was thinking in something like +1 to one characteristic and a way to prevent damage or advantage in a saving throw x times at day or if receiving damage make the enemy recibe back. What dou you guys think?