If she ran into a Legendia-verse monster? Yup. Her friends have her trained pretty well there. It would just take a bit of explaining with any other kind of monster--or it getting a few hits in on someone/something. Then it's casting time!

Yeah, the poor man has enough to worry about, I'm sure. Plus the sheer WTF value of Grune of all people using Curse Eres would be pretty fun, I'm sure! (She actually specialises in them and the light equivalent, Sea, in her upper levels. XD)