Mupy-Mup!
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True, after using tactics, you need time to recover; attempting another one in two weeks is too soon.
After clearing the basement, you can do it every day, or make sure you have enough turns to run to the mentor and back, collecting all the one-time buffs. The problem is that Greta might be too strong, but that can also be solved.
Added 20 minutes ago
You can do without a mine; the upper garrison of the city is essentially a mine.
In principle, yes, but depending on whether you're exposed outside the castle or hidden, the initiative scale changes. It's a matter of what's more convenient, and you might have to experiment and juggle units, but the point is that it's different at the start of the battle. I don't know why.
Added 6 minutes ago
Regarding the changes, I'm not planning any for this map for now.
Well, at least put a mine in the catacombs, or a garrison, between the portal and the hydras, so you can deploy troops. This is purely a tactical thing. If you really want to, you can run to the nearest mine at the top (where the blue gems are?), but that's a lot of running, so what's the point?
Added 7 minutes ago
The default build is designed for quickly eliminating the sworn enemies, and the chaotic one, which is even more effective because the Druid channel also buffs the Daughter of Silanna. Both options allow you to comfortably defeat the Necropolis.
That's true, but the chaotic build ends up creating problems for ourselves, which doesn't seem very heroic in the current situation. I've already tried it. If you upgrade it significantly and compare, the chaos build won't work.