With a grimace, Katraya surveys your expressions and nods reluctantly. Taking a deep breath, she leaps back - drawing the antimagic field away from the area where the dream vestige lurks.

The creature of nightmare reappears, but for the moment you have the initiative: you knew where it would appear, while it has to take precious seconds locating its prey.

Spoiler: Ooc
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Everyone who readied an action (I'm reading Perseus as having readied instead of delayed) can act now.