How do I kill a water queen with a medusa shield?

[Argitoth]

Some of your suggestions would simply take a lot of testing. There's too many variables, too many unknowns for your suggestions to be valid, such as:

-Horrors might get killed from medusa shield
-Gift of heavens is too inaccurate
-Gift of heavens casters are hard to get in numbers
-Gift of heavens may not be casted after script is over

The only suggestion that I think may have a decent chance is the sceptre of corruption. However, for this situation, I don't actually have access to blood magic.

BUT LIKE I SAID! I don't need anymore suggestions! I'll reveal my plan after it has been executed.

EDIT: Lol, I just did a test with the sceptre of corruption. There's no way it would work. I bet a group of mages casting banefire would work though. However, the problems are pretty much exactly like the problems of Gift of Heavens.