"Necropolis" - changes to creatures of levels 6-7.

well, if Presence is active, they can have 150 HP, so let's give the Undead unit 150 HP as well, and with the alternative upgrade, we get a tank – that would be more logical.

150 with Presence is practically 250-300 without it. Isn't that too much for a damage dealer? I would lower the Initiative of the Heralds to, say, 9, as an additional distinction from the Banshees. Presence will still allow them to go first. So, considering the Initiative reduction, HP should be capped at 120.