I'd say take out the larger ID first, if it wakes up you'd be in a TON of trouble!!

The best course of action would seem to be to kill the larger Id first then take out the smaller one, and finally destroy the cocoons before they hatch so that they can't break out. That would seem to be the most logical order. Maybe you could also see if Arty can dismantle the magic of the circle with her makeshift staff. Seeing as she hasn't tried it out yet. Though that should probably be a last resort since it may well backfire on her.

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Take out the small Id first, since it's awake and (probably) the most immediate threat. I don't want to take out the cocoons until I know it won't attack us while we do so.