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I agree that Inferno is the most expensive Castle in terms of cost and the mismatch between its price and the total XP gained per week. But please tell me, which other Castle can compare to the rush strategy when you have Devils? Having even 1-2 Devils allows you to attack monsters of all levels (those that don't shoot). You can defeat a group of Behemoths (I'm talking about neutral creatures) with just one Devil. I agree that you need a lot of dwellings, and it's difficult to build them to 200%, but if the map isn't too poor, you can even do it in the first week (although 200% is almost impossible), but even if it's in the second week, that's still not bad.
Recently, I played as Inferno with the Warrior hero, Pyrre (difficulty level 160%). I can't play as Inferno at all. My opponent was a Swamp Castle with the Warrior hero, Gervulf. Weighing all the pros and cons, I realized that Inferno has more disadvantages than advantages. Inferno is the most expensive Castle of all, and it's also the weakest in terms of "meat," that is, the total amount of XP of all units. The only real advantage of this Castle is the rush strategy with Devils and Efreet, which is what I did, building Devils and using them to clear out all the hidden spots and visit the resource locations. After spending all my money on building Devils, I didn't buy anything at all before the start of the month (I didn't buy anything during the month except Devils and Efreet). The next month turned out to be disastrous, and I was left with practically nothing. The only hope was good magic on the upper floors. On the fifth floor, I found Implosion. I had enough Wisdom to learn it. I must say that at that moment, I realized that I had theoretically won (if I didn't make any mistakes). I started attacking my opponent with a catastrophic disadvantage in "meat" (it turned out that my opponent had Dragonfly and Lizard dwellings, and their number exceeded a hundred at the beginning of the second month), and !using the first turn of the Devils! I cast Implosion and paid them off. That's how the game ended in my favor. Even though I'm a good Warrior, I knew how to use Implosion with 1250 + Devils, which decided the outcome of the battle. So, another advantage of Inferno is the good speed of the Devil and Efreet. Later, it turned out that Gervulf also had Implosion, but the speed of the Devil didn't allow him to cast it even once.