i started by upgrading what i could on the necro town,
i didnt upgrade creatures on haven town, only money stuff.
after i built liches wights (and wraight, wights) and vampires,
i got out, built a boat on the LEFT side of the island, and went north
west. when you get to the beach you have several mines and creatures
that you can take. if you see necro creatures on the map, always attack them, they'll join you. i went north, found the inferno area. i killed
archdevils and pit fiends for the artifacts. went up and took the town.
it was easy, no serious guards there. i took the boat east, when i got to the shore i saw another town. it was too hard for me, so i went east more to the eastern town (ziyad). i took it. at that point it offered me to curse the town. i cursed it, went back to the westren town and cursed it too. the point was that cursing not only means more army for me, it means the cpu won't be able to get more of his vicious army.
after that the green elves started roaming around. they took my haven city. before they came i took isabel to necro city, and protected her with creatures there. the elves didnt follow.
i wandered in the map, gathered creatures, exp and artifacts,
and got back to original necro town to get more army.
i took army and kicked the ass of the green elves for good.
by that time i had like 2k archers, around 100 arliches, 115 vamp lords, 19 bone dragons, 100 spectres.
i went north to take the last town. by that time the CPU took ziyad back, but i didnt mind, since its necro now, he won't enjoy the army there. i took the middle town, and my army got to like 3k archers.
i didnt use any raise undead/animate dead or stuff like that. i powered up my hero with destructive spells, and i mostly do chain lightning. when i took last city i used few phantom forces on archers.
went north, took the garrisons, took the last town.
it said i cleared all objectives but raising 20 bone dragons, but that was easy, 3 of his academy cities became necro coz of the curses. so i built 20 bone dragons easily and went to the portal, and thats it.
i gathered in the final fight something like 5k archers, so it went ok.
Subscribe to our Telegram Channel "maps4heroes.com" to be the first to receive NEW Maps and News for Heroes of Might & Magic 7, 6, 5, 4, 3, 2! 
