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Well, like many others mentioned, I rushed to Ludmila first. Sharka appeared and attacked, but I had to fight him again later in the Castle (almost directly below ours). Here's the order: clear the territory, reach the fork in the road, capture the fort on the right, go to Ludmila (even further to the right and down), clear the territory until the hero-orc arrives, teleport to the Castle, and start building Spiders as quickly as possible. Only take money from the chests; there will be plenty of experience, but few resources. Go and defeat the orc, develop Ludmila – she will move on to the next part of the story and will be a great help. Be sure to upgrade her Logistics, Pathfinding, and spells that deal high damage; she will use them to eliminate neutral units (Ice Bolt, etc.). By the way, also upgrade Nastya's Logistics; she will be needed in the next map, even though she has a lot of stables and +6 boots, she still moves very slowly. So, defeat the approaching Sharka (orcs deal a lot of damage, don't wait – they have some kind of speed ability and run very fast). He ran away from me, so I chased him past the entrance to the Dungeon. I did NOT kill the guards (fire elementals) at the entrance to the Dungeon, and the demons didn't attack me at all. I went straight down, captured the orc city, defeated Sharka, rebuilt it into a Necropolis, and went to the right (looking ahead with the hero), defeated the Lizardman who arrived (Necropolis), reached the end of the island, captured the fort, went to Ludmila's Castle, developing the former orc city along the way. I gathered troops with Ludmila, gave them to Nastya, and went to the Dungeon. In the Dungeon, I first went all the way to the right (looking at the hero), where there is a fort and a growth building. I rebuilt them into Necropolis structures, then I had to teleport back home. Another Lizardman arrived (he, that nasty undead creature, attacked me about 7 times during the mission), and I didn't have enough troops yet to give to Ludmila. Later, I left some troops with Ludmila and sailed with Nastya, while Ludmila defeated the Lizardman a couple of times (he either runs away or is resurrected and comes back), and Ludmila received him in the fort.
Okay, with Nastya, I went to the Dungeon again, now further to the left, found the Castle, it's VERY tough, it attacks every turn with a Fireball that deals about 400 damage to all units, but I defeated it (by the way, the "worms from the ground" are hilarious, I almost dropped my laptop when they came out). Then I rebuilt it, built a portal, brought Nastya a growth building, and went to get the staff; it's all simple – Chain Lightning is our everything in this and subsequent scenarios. I came out, had a snack, and sailed to the islands; there is also one arena there, then to the very bottom corner of the enemy island, where there is one orcish Castle, I captured it, rebuilt it, went higher, and there is another Castle and a fort. I had a snack, and I had about 140 high-level Spiders and everything else. I approached Miranda – there is no danger – I started attacking, and she turned out to have the SAME army as me! That's crazy!
The spells that are ABSOLUTELY necessary: Chain Lightning (all upgraded air units), Explosion, Poison Cloud (earth), TELEPORT – move the Spiders one tile away from her Spiders and defeat them. Lightning, Rings of Cold, everything that deals high damage – it's a must! Slowdown, weaken all, resurrect ghosts and just annoy the ranged units with them. Vampires and Spiderlings solved the problem; all the others were defeated. Miranda casts Weaken All and Protection from Ranged Attacks, Stone Skin.
Good luck to everyone!
Added 4 minutes ago
My long message disappeared ((( what a disgrace! I will only write that – upgrade Ludmila, she will move on to the next scenario, upgrade her Logistics and damage-dealing spells – she will kill neutral units. DO NOT go to the Dungeon until you defeat the orcs, and do not kill the guards at the entrance to the Dungeon – the demons will not attack on their own. Until you have 150 high-level Spiders, you shouldn't even think about attacking Miranda. Upgrade TELEPORT! – and move the Spiders to a position behind her Spiders. As many damage-dealing spells as possible – Chain Lightning is the coolest with upgraded air units, Explosion, and Rings of Cold. Good luck!