How is Dark Messiah connected to Heroes of Might and Magic?

Exactly... about the walkthroughs!!
After all, we're not watching a movie...
One thing is clear: Sareth is the son of Isabella and Xa-Beleth...
The rest is a product of our boundless imagination!
By the way... I had an idea... Could the Master have corrupted Biara, so that in the end she would become Xana?