Two sisters.

I completed it in exactly four months, playing as the "hero." I played defensively, staying in the dwarf castles and destroying the ballista in front of me before it could create openings in the walls (fortunately, the dwarves have strong cities). After that, I focused on archers and flying units. The AI, with its superior army, would often retreat. What I liked was that there were challenging battles. In quick battles, the AI often retreats without inflicting any losses (I suspect this is a bug from the game developers, so I had to replay without auto-battle for fun). The AI in the dungeon in the central city is passive and allows you to pass by. Thank you for the map. I'm looking forward to more challenging maps.