Thoughts on the scenario after completing "Hammers of Fate".

Then the question arises, why did he create the heart? I think he knew that after some processing, it would no longer repel demons in Shi'o, but summon them from there, so to speak, he gave Nicholas a "time bomb"...

I don't know exactly how he got it, or where from. I played through the entire original game and Hammers of Fate, but I couldn't find it anywhere. And I still don't understand - in the last dialogue scene in Hammers of Fate, Biara sheds the guise of Isabel, what does Alaric do next?