TL;DR:
Returning players wouldn’t know that Avenging Wrath is tied to the Shock and Awe rune unless another player tells them or they happen to find it in an online guide.
Like many returning players, I was really excited to see all the runes available in the starting zones. But for some reason, there’s no indication that Avenging Wrath is included as part of the Shock and Awe rune. You can buy Shock and Awe from the vendor, but there’s no mention that AW is a quest-only ability or hidden in some way. That’s kind of a big deal for Paladins.
Did I miss something along the way? Or is this just poorly communicated?