Magistar
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You still need to find a helmet and sacrifice +2 Morale and +2 Luck. This is very unpleasant against Creatures of Armageddon. Especially in 3.1, where dragons inflict -4 Morale/Luck.
Leaders under control are killing goblins.
All that remains is for the hero to attack against Blindness and Sleep (1 vs. 2), or for the hero to attack against Sleep and negative Morale. And the hero will have more initiative than the vampires. The situation is clearly not ideal. If the leaders are under control and the shamans are defeated, control over the Necropolis is guaranteed, no matter what.
And again, this is if the hero moves before the leaders and goblins. You also need to consider who has more artifacts for initiative.
Added 2 minutes ago
The patch description contained almost nothing of the important changes. But everything was in the English manual for 3.1.
Added 3 minutes ago
Neither 5k nor 50k in the late game seem to be a problem. However, everything really comes down to the ability to seize neutral castles. Most often, this is possible in the late game. Was it not possible in a particular game? Too bad for the donkey, i.e., not a problem :-)