Tactics for Necropolis.

Since you are playing without the usual restrictions, it is easy to see the following. Vampires can be recruited and upgraded. And upgraded vampires can break through most buildings without any losses. As a result, your army remains intact, and your income increases. The same applies to skeletons. Plus, there are three excellent heroes: Galtran, Izra, and Vidomina. And when Galtran is leveled up, the skeletons have base stats of 12 and higher. If you upgrade them, they will have incredibly high stats.
As a result, by the final battle, your army will be under the command of a powerful hero with troops consisting of: skeletons, vampire lords, dark knights, possibly liches and dragons + angels and wyverns. The relative weakness of archers is easily compensated for by the power of the other units, especially the skeletons. There are no problems with gold and resources, and the troops will suffer almost no losses.