after you kill Belfihet at the end of the game, can you save the game and return to kuldahar and stuff or are you stuck in the crystal tower?

When you beat the game your characters are automatically exported. You can then import your characters into a new game if you want, and start the game all over again with your old crew...

Warning: If you don't have the expansion, your going to walk all over the mobs, though Bel is still gonna be a bit of a pain by the time you get to him.

Thats what i did, re-import my characters and do it again, but if you dont have the expansioons you can only get xp up to 1810000 and then it stops.