kolotok
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Valeska is a good starting hero for the main quest, but I prefer more stable and reliable options with Angels from the Conflux, although without rushing and mainly focusing on the main quest, while the others just bring and deliver...
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By the way, I didn't understand if this is intentional or a bug: the passage between the two pink cities is blocked; there is a guard and a road, but the obstacles are arranged in such a way that it is impossible to pass.
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It's still unclear in this map how the Necromancer attack is carried out (whether any events, timers, etc. affect the arrival of the Necromancers). Sometimes the Necromancers appear on the 3rd month from the one-way teleporters with 2-4 heroes and all their legions (and then they either stay in the captured cities or fiercely harass everything around), and sometimes they just sit on their spawn point and don't come out, or they just take the tent and a couple of random heroes without the main force come to visit, and it's not clear what it depends on....
I think that progressing by slowing down the enemy and getting Angels in the Conflux is the author's intended "correct" plan.
I agree about the author's mistake with the obstacle between the Flax castles, as the road blockage doesn't serve any reasonable purpose.
I believe that the Necromancer's appearance depends on several factors at once:
1) The Necromancers have a large spawn point, so there is a very large variability in the behavior of their heroes - where to go, which guards they will attack, whether they will join forces and with whom, when, etc.,
2) when exactly they will break through the green tent, and what guard will be generated near the tent (the stronger the guard, the longer it will take to capture it),
3) where the Necromancer heroes will be teleported from the one-way teleporters. Ideally, not too strong heroes and their armies should appear in the guarded exits from the teleporters (for example, behind the Crystal Dragons),
4) also, I think, our accumulated forces and their location influence it. If our heroes spend the night not far from the open exits from the teleporter, with a VERY high probability the Necromancer will not jump out and will wait for a better moment.
So, it is impossible to predict how these factors will come together. Therefore, it is better to quickly take the Fortress and go to the Necromancers first.