All they have done is make the free text field for deity entry a dropdown selection.
It has no additional purpose other than to stop people making spelling mistakes for their chosen deity, and preventing people from entering their own made-up deity
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It also allows servers to create their own dropdown lists of custom deities with custom restrictions. Most players don't even realize there is a deity field in NWN and that makes Father Phastus cry.
The Forgotten Realms campaign puts so much emphasis on deities I was surprised they didn't focus on it more in NWN. After all, in the Forgotten Realms, if you die without a patron deity your essence is added to the Wall of the Faithless surrounding the fortress of Kelemvor on the Fugue Plane. No one wants that to happen!
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