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The "resurrection" spell can be found in the human Castle, in the south. After that, I fought without any losses; I jumped over the guards from the shore to the Castle, so again, no losses. I took the last city relatively easily; I had the "suggestion" and "blindness" spells. I blinded the titans, and the rakshasas killed their opponents very well, as they don't receive any counterattacks. I lost 9 gremlins and 4 djinns. I completed it in 5 months.