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There are several Heroes of Might and Magic Online games. There’s one specifically for the Chinese market. But the one I’m talking about is a browser game; as far as I remember, it doesn’t require any clients. I can’t say anything about its current status. A long time ago, when it was just launched, I played it for a couple of weeks. It was quite good for a browser game; I liked it overall, and the visuals were particularly impressive. Then, I checked it out again after about six months, and the rules had changed significantly. There was less emphasis on pay-to-win elements, or rather, they became less significant, but I was too lazy to figure it out and didn’t start playing again.
As for the icons, I took them from the game’s wiki:
https://mightandmagic.fandom.com/wiki/Category:Heroes_Online_creaturesHowever, it doesn’t contain all the creatures, so sometimes it’s better to just Google them.