Tiaral

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After all, you could have summoned a mob a long time ago.

One that won't fit through the door. They can be quite large.

Or even try to control someone.

The range isn't right. You'll still have to go into the second room and, most likely, come under fire. And move to one of the positions I mentioned.

It's enough to simply cut or crush the face/burn/otherwise disfigure the corpse to the point of being unrecognizable. And if you don't have enough imagination, just take it with you.

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The body of Sharon himself must be destroyed.

And I don't think we'll have the opportunity to discreetly remove the corpse from the palace. That's why I like the idea of devouring him – if there's a suitable monster, nothing will remain of Sharon. No suspicious disfigured corpses. And I interpreted the command as "destroy the body" – destroy it completely. If it's possible to get by with simply disfiguring the body, that would be great.

Added 16 minutes ago
Another thing is that our situation is really bad right now. So, casting a spell on you might be worthwhile. If you live that long. I see two options:
1) Cast "Mirror" on Kataviana, and then have her execute the resurrection plan.
2) Try to control the crowd of guards. But this would involve moving Emma to one of the positions I mentioned earlier. And there might be a catch in the fact that they have helmets with protection against mental influence.
I don't think summoning a monster is such a good option. As you yourself said, they are random. Something might be summoned that dies from a couple of blows from the guards. Something might be summoned that can't get into the other room. And Reven doesn't even want to give me a list of possible creatures. And of those, I only remember a snake with 4000 HP that takes up a lot of space.

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