Would i regain mana, for the dmg my energy shield is taking? Or does it need to affect my life?

thanks.

good info, ty

Yes and no. Yes, it works, but as dgtm is based in damage you get. Your life only gets 5% dmg (if 95%es) and you usually have low life (1000-2000), the returned mana is not very big. So it's not usefull. It's better to just forget that stats.
Some kind of barb vs barb builds use it, but they have high life and low mana.

Dgtm useless on es sorcs