At level 90, you gain access to Beyonce-inspired spell, Halo.
It’s an AoE healing (or DPS) type spell depending on your spec. The healing scales depending on the distance between you and the rest of your targets. The biggest impact occurs to players that are 25 yards away. That’s going to be a little tricky for you to eyeball. Would be nice if AVR was still around so that you had a HuD telling you how far exactly 25 yards away was.
Halo isn’t a spell that’s targetable. It uses you as the main point before emanating outward.
You can see it in action below.