Heroist
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Basically, I'll either cast a barrier or have you position yourselves so that the mobs aggro onto you as a group near the ghost, and I'll clear them out. I have an area-of-effect spell.
It's a bit more complicated with the others. I was initially planning the positioning for the barrier, but on the other hand, if the ghost breaks through and uses its area-of-effect attack, it won't be good. So, I'm not sure, maybe I'll come up with something later.
For now, here are some preliminary suggestions: Anemone should move one square above Ment (or to the right of Celena) and shoot the ghost with her bow. Arya should go into invisibility. I'll use my area-of-effect spell on 4-6 targets (either covering Nebka or covering the rest, but this depends on how Revan decides to handle the diagonal shots).
Whatever