User blog comment:Miskos3/Fairy Tail Chapter 379: Tartarus Arc, Part 3: Underworld King, Review/@comment-4449950-20140404073720/@comment-121.97.85.186-20140404101032

With Erza's currently shown abilities, I don't know which of her attacks would make a good Unison Raid with Jellal. So far, Lucy's Uranometria is the closest one that I imagine that could do Unison Raid with Jellal's Heavenlt Body Magic.

I think Jerza can do a combination attack but I don't think their currently shown magic is compatible enough for Unison Raid.