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So, the issue is most likely that the AI doesn't take the upgraded stack into account?
The problem is that the AI sometimes overestimates its strength and attacks. Not everyone can defeat 29 stacks of Greater Spirits, but you expect the AI to do it.
"Никто не уходит из героев вечно", - убедился на личном опыте, гоняю в сингле до сих пор :D