New threat.

The monsters on the hero are quite strong, and which magic tower are you talking about? I don't seem to have noticed it.
The saves still won't load.
Maybe add some stones and other debris. Or create something like ruined buildings.

The magic tower is a small tower that reveals areas of the map; it's located in the south, in Necropolis territory, and it's not that hard to find – it's almost in plain sight. It's guarded by 4-5 phoenixes. There were plenty of stones and other debris before I cleared the map. Regarding the saves – at the beginning of the game, they wouldn't load for me; they were about 15MB. Midway through, everything became normal, and the size was around 13MB. I completed the map, trying to play as if I knew nothing, in about 3 hours. If yours is larger and you haven't received the final quest from the prophet before entering the dungeon, that's a reason to think carefully about the correctness of your chosen strategy for completing the map. I can tell you a little more if your game is taking too long.