Legacy of Kain - Soul Reaver
Instead of choosing death (his punishment was eternal life), Kain decided to rule the world of Nosgoth at the end of Blood Omen: Legacy of Kain. With the Soul Reaver in hand, he had become power hungry, completely forgetting what his original goal was -- to avenge his own death by seeking out the people who murdered him.
His empire was built on the foundation of vampires and monstrous beings -- human life had become non-existent. Kain saw to it that every human was punished in some way; they were turned into vampires, or given the ultimate punishment of death. Raziel helped his empire grow and eventually surpassed Kain in duty, rank, and leadership. Needless to say, the ruler was not happy.
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