He immediately regrets that thought.
As the group hurries back to the grate, that is when Onyx drops from the hidden ceiling and lands, heavily, right on top of their exit. Immediately, she rears up and throws open her wings as her dragonfear begins to spread in all directions.
Magpie immediately yelps and dives behind a pile of coins in fear.
"Fools!" Khisanth hisses in the Common tongue. "Did you think I would allow you to steal the disks right from under me?" She laughs. "Not only have you failed, but you have brought the staff to me, as well!"
Glancing at the staff in her hands, Goldmoon sees that the illusion has melted away, and the blue crystal of the staff is pulsating lightly, like a weak heartbeat, giving itself away.
As the Chieftain's Daughter contemplated what any of this means, she heard a voice in her head. "Give the disks to someone you trust for safekeeping, and hit the dragon with the staff. All will be well."
"Bring me the staff, and I may let you live," the dragon growls. "Refuse, and I will begin killing you one by one." As if to emphasize her words, a drop of acid dribbles from her mouth and splashes on the ground at her feet, sizzling and bubbling lightly as it eats away at the floor.
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Laurana saves vs dragonfear (1d20): 6, fail. Laurana suffers a -1 to hit
Raistlin saves vs dragonfear (1d20+3): 8, fail. Raistlin suffers a -1 to hit
Tanis saves vs dragonfear (1d20): 11, fail. Tanis suffers a -1 to hit
Goldmoon saves vs dragonfear (1d20+2): 22, pass! Goldmoon shrugs off the dragonfear.
Riverwind saves vs dragonfear (1d20): 4, fail. Riverwind suffers a -1 to hit
Flint saves vs dragonfear (1d20+5): 19, pass. Flint shrugs off the dragonfear.
Magpie saves vs dragonfear (1d20+4): 12, fail. Magpie suffers a -1 to hit
Sunstar saves vs dragonfear (1d20): 11, fail. Sunsutar suffers a -1 to hit
Tasslehoff is immune to dragonfear, due to being a kender.
Sturm and Caramon are immune to dragonfear, as they are 6th level.
I'm using the 1E rules for dragons (and only dragons) in these modules, because frankly, if I used the 2E stats for dragons, your chances of success against her would drop from slim to nil.

So, what shall you do? Fight? Try to flee? Parley? Good luck!