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Thanks, Invisible, for writing the report.
However, I believe that the opponent wouldn't have been able to defeat me even with a full mana pool, because the damage of his lightning spell exceeded the damage of my spell plus the damage of the castle by 70, and the HP of my troops was more than 3.5 times higher.
I didn't take the Breastplate because there was no book available, and there was nowhere to buy it in the near future. Also, I could have lost a lot of troops (especially if there had been Titans), and in the end, I wouldn't have had enough troops for the first battle with the opponent, which became the key battle.
The map is fun - I fought only with troops recruited from the buildings, while the AI had a Knight with Boots and Gauntlets.