Amy flinches back as a sheet of acid drenches her, singeing her hair and scarring her face.

Ach, more acid?

She gives Baervard a small smile as he stomps off to face the beast and throws her hand at the creature, trying to think of some useful magic to bring forth.

Spoiler
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Knowledge check for IDing the wraith (mostly for the sake of form): (1d20+18)[23]

Cast Magic Missile at the thing. Poor, but at least it wont miss (or be affected by the incorporeality).
(1d4+1)[4]
(1d4+1)[3]
(1d4+1)[4]
(1d4+1)[2]
(1d4+1)[5]
Then will use a Pearl of Power to reclaim the spell.