The important thing about this build is that you have to get people in the center of "sacred sweep" in order to do increased dmg and to blind (when you hit lvl 13). I pick "Energized Cord" for level 7 because it gets you energy fast and more energy= more heals. "Empathic Link" isn't as good because if your team is wrecking/not fighting you're not gonna have much energy for heals. I would get "Converging Force" for level 13 since you could get the enemies center up for the blind but the issue with that is you tend to mess up your allies' ults and what not more often than it's worth.

NOTE: The level 16 and level 20 talents are completely situational and up to you. If you have a lot of attack damage characters on your team who definitely do not use ability power then get "Will of Heaven". If you have a lot of ability power characters on your team then get "Wrath of Heaven". For level 20 I get "Shield of hope" because I think the shield is better than the "Diamond Resolve" shield since Shield of Hope shields your whole team. Angelic Flight is good on some maps but I find it's still not that useful.

If you have to hold a lane by yourself for awhile until the objectives pop up it's best to get "swift sweep" and play safe. Stay by your towers and cast "Swift Sweep" on whoever you are facing, then return back to safety. Auriel can chunk people down slowly but surely and eventually they will have to go back to heal.

This build is pretty much exactly the same other than the faster sacred sweep (aka swift sweep). Angelic Flight might be good if you have to defend a lane by yourself.