Evolution of the AI.

a little about the canceled game:
After the release of Heroes 4, 3DO was no longer involved in the Might and Magic universe. However, there is evidence that the struggling company still tried to develop Heroes 5.

This is what the Black Dragon might have looked like in that unreleased game. Its skills, which have remained unchanged throughout the previous four installments, would likely have remained traditionally the same, and the Black Dragon would have remained true to itself.