Sorrina Westyr - A Crunchy Lore Question

[pgfrix]

Uhm, they call it out in the scenario you find her.

Noted, and many thanks for the reminder.  It's easy to see why one would forget that when, given opportunities in other appearances, she doesn't actually cast Plane Shift.

That said, I'm still wondering what this spell effect is:

From further in, a terrible draconic roar accompanies the appearance of a flight of crystalline dragons sweeping out from the lip of a crater.

“Secure the gate! Do not let any of them through!” Westyr shouts as she sends a lance of swirling black and white energy into one of the wyrms, sending it careening end over end as the forces meet.

My working hypotheses:
Clever interpretation of Flame Strike (non-vertical?)
Clever interpretation of Shout
Disintegrate (L7 Domain) (too short, as statted)
Finger of Death (too short, wrong spell list)
Ring of Major Spell Storing
Compton's Fiat (Level Eleventy-Seven Deus Ex Machina)