Tiaral

Let Emma summon something. Revan says the summon is random, and you can't summon anything to the upper level, but I think it's worth the risk.

Summon something in the hope that it will shoot/cast spells/fly/teleport? It looks like a very risky gamble, but the alternative is just to put a mirror on one person, which isn't bad, but it's a bit boring and doesn't feel like a winning strategy. Let's go for the summon, at least we can see what kind of mob it is.
However, most likely I'll just get shot before I can even move, and I won't have to rack my brains.