Radik
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Therefore:
1. Hiring a dismissed hero on the day of their dismissal is prohibited. On any other day, it is allowed.
2. Hiring a hero who has escaped (by paying a ransom) on the same day is allowed.
3. Hiring your own deceased hero again is prohibited.
4. Hiring a deceased enemy hero is allowed at any time.
I think that point 3 needs a couple more words - "Hiring your own deceased hero on the day of their death is prohibited".
Radik