Whether you get the choice to become a good god or an evil god depends on how you respond to Solar's little chats after each bhaalspawn is killed, if you say stuff like you only kill for good and you feel sorry for Sarevok then you'll be seen as good, and if you say you want the throne of Bhaal because it's your right and you love killing etc then you'll be seen as evil. So you can only ever get two choices at the end - mortal, and good/evil god.
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