Guard Reinhardt

I haven't tried it because I don't think Reinhardt is intended to tank much.

Guard is handy for tanky units that want to stay within a certain HP threshold and deny enemies their special charge. I don’t think Guard is suited for Reinhardt since he’s a hyper-offensive unit that aims to kill in one round of combat. He’s better off with a Breaker skill in the B-slot, in my opinion.

I would recommend Guard for units like Lukas, Beruka, Micaiah, etc. Generally units that are defensive in their play style.