New order.

The bonus received for defeating the Tower is not worth the time and army spent on it.

I managed to defeat the Tower without any losses (although it took a few tries). 😁 Ring of Luck Reduction, Staff and Cloak of the Undead, artifacts for magic resistance (hero armor and 2 items from the Dwarf set, although I'm not sure if they played any role).
The hero outside the castle fled in auto-battle, and the hero inside the castle managed to cast Shock Earth on the archers once (Alarik had enough magic to resurrect them in one go), but didn't have time for a second cast.
Although, during the first attempts, when I was hit by a lucky Shock Earth, I thought about giving up and retreating.

Faiz is easily defeated and is not interesting at all.

O_o. What did you use to attack? The Academy or demons?
I'm just looking at how the remix defeated him with the Academy (and it didn't seem particularly difficult), while I didn't even think about it during my playthrough. Besides, I didn't develop the first city at all because I was sure that it would fall sooner or later, and my mage wasn't leveled up either. As a result, I fought Faiz with a purely demonic army (except for the horses, which I didn't build, so there were only 6 stacks in total) and a centaur-perk build + ballista.