Does anyone know what happens if you give Phaere the genuine Silver Dragon droppings?

Spoiler
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There are two options.
You can interupt the ritual, Matron Ardulace casts a spell which reveals your true identity. You have to fight your way out of the city.
You can let the ritual go ahead and the demon lord is summoed. Being evil he casts a spell to reveal your true identity. Then you fight the demon lord and the whole drow city, and then you have to go face the angry silver dragon.
Have fun ;)

you can also give phaere the fake eggs and then give the real eggs to the dragon, get a nice +4 halberd and a way out of the underdark (so you don't have to face adalon)