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A very simple mission. After spending some time in the city and exploring the surroundings, without even looking at the Inferno structures, I upgraded the Castle to Rakshasa (basic) level, without upgrading any units, and headed to the portal in the northeast. I conquered the Necropolis Castle in the middle, near the port, and stationed a secondary hero there. Then, I went north to the difficult Castle without a hero. Luckily, there was no one there to attack me! I cleared two control points on the way, and another secondary hero arrived from the Academy (where I had already built Titans), bringing reinforcements. I slowly developed the Necropolis – there was very little money, even though I focused on building "money-making" structures. Plus, there was a mine on the way to the difficult city.
Next, I went to the Necropolis on the west, through a portal. These portals are something else! You have to jump into the same one five times to get where you need to go. On the way, a well-prepared hero emerged (I don't remember if it was a man or a woman). While I was fighting him with my main hero, my secondary hero went to capture an empty Castle. Just as he arrived, the enemy's secondary hero appeared with two Bone Throwers. I had 13 Armored Archers (being built at the top portal) and very little magic, but more mana than him. However, I must give credit to the computer – he hit me twice with an arrow, my magic ran out, and the dragons flew up and stood there, increasing their defense. The Armored Archers ran around them, but they didn't attack at all. I exited the battle with three Armored Archers. This glitch saved my secondary hero and allowed him to capture the Castle. After gaining the Undead bonus, I went to crush the enemy's secondary hero, who had become quite powerful after the battle with the dragons, and his high-level Order buildings. All the recruited companions were turned into undead. With my second hero, I went to the Academy for the bonus and then headed to the upper Castle. And then HE arrived (I mean, he sailed in). I ran with my main hero as fast as I could towards the port – it was useless. The most I could do was have my secondary hero (who had fought the dragons) reach the Castle, buy half of the creatures – a huge drawback of the mission was the constant lack of money. I even had to sell a lot of resources, which I almost never do when the Castles are not well developed.
In general, HE arrived, the danger was high. Zombies, Archliches, the city, and luck saved me. We had roughly the same number of Zombies – about 200, and Plague Zombies. When buying creatures, I focused on archers. I ended up with about 250 Skeleton Archers, 200 Plague Zombies, 50 Vampire Lords, a few Spectres (about 20), 50 (!!!) Archliches, 2 Death Knights (hilarious), and 10 Bone Throwers. He had 100 Archers, 200 Plague Zombies, 100 Spectres (!!!), 60 Vampire Lords, and 15 Messengers. Thank goodness, no dragons. I only used magic to raise the dead. Again, the luck of the mission was that he only slowed down my units, without resurrecting his own. This is a level 16 mage! I exited the battle with 40 Archliches, 150 Archers, and almost unscathed Zombies.
After that, I went with my main hero to the Arena (near the second Necropolis, on the west), and obtained the Cloak of Deadly Shadows, the Ring of Life, and the Necklace of the Werewolf Claw (I looked it up here, I don't remember the name in the game), which gives +1 damage. Then, I went to the northern Castle and quickly defeated it – there was no hero, and the troops were roughly equal. I thoroughly crushed him, cast all the spells I could on my Rakshasa Princesses, and quickly defeated them, even though he had one and a half times more Thunderbirds.
Then, I sailed south (remember the Necropolis campaign?) and first defeated the human Castle, then Mythgard. That's it. 2.5 hours.