Necromancer – “Invasion” [Campaign 3, Mission 3]

Hello everyone! Can someone help me? I captured one of the cities with a hired hero, and I haven't figured out where to get artifacts from (I have a pirated version, and it's heavily localized, so it's easier to understand in Chinese). Because of the large number of heroes, I fired him... and judging by the fact that all the cities are captured, but none of the heroes have a cloak, it seems it was on him... :smile35: So, what should I do now? Has anyone else had this problem?

P.S.: Although, as mentioned above, artifacts only drop from heroes, I captured an empty city with this hero... and even if the cloak wasn't on him, where is it????

Thanks in advance!