"YOU SHALL NOT PASS!" I pound my staff into the ground and collapse it. Everyone falls into a bottomless abyss.

"Ha! I was merely acting!"

I use CRUD (Complex Ray of Ultimate Destruction)!

Aiming at the most injured or nearest frost giant:

6 beams.
Die roll (+13 to hit)/damage
32/4
27/8
26/6
26/6
23/6
Natural 1

I don't think the damage gets any kind of bonus.