I just don't understand...
a) What's the purpose of the lower-tier Vampires? To attract the Spectres? Unlikely...
They are placed in two stacks to select the units with the lowest initiative, and from which they can recover. In this case, it was the Black Dragons.
b) Rushing to level 7 in a battle to the last is understandable, but on what map did this game take place? After all, first you need to get there... And secondly, reaching level 7 in the first week is crazy... But it's clear that the player is smart - I wouldn't be surprised if he reached level 30 in a month with such tricks...
As far as I remember, it was the Dragon's Passage map.
And regarding the leveling up - on some maps, you can reach level 27 in just 2 weeks. I've personally verified it. Not with a Necromancer, though...
Горящие реки сходили с ума, пытаясь остаться водой,
Земля пропустила коварный удар, раскрывшись на шаге вперёд,
Взлетел разъярённым драконом Огонь и понял, что тоже умрёт...