What was the spell anduin cast in the cinematic?? the bubble?

One that wasn’t near as cool as full banshee queen mode.

100% agree but im still curious

Mass ressurection

I think it was closer to something like a large holy nova, and not resurrection.
It'll be interesting where his story continues, especially having Il'gynoth's whispers in mind: "The boy-king serves at the master's table. Three lies will he offer you.". Assuming of course he's referring to Anduin.

Now that you say it agreed

It was the paladin ultimate ability from warcraft 3

dis

in wc3 pali can ressurect 6 nearby corpses

Thats exactly what anduin did