[XL] Heroes of Fallen Wings - Heroes of Fallen Wings

I just can't remember where I found the Thunder Hammer in my previous playthrough. In this one, I've searched the entire map, and I'm left with only one Netherim from the entire Army of Terror, but I still haven't found the hammer. I did the quests not for the Haven faction, but for the Chaos faction; maybe that's the problem. I also can't remember what I did to get it.)) But I definitely had it in my previous playthrough, and I even let my hero use it for a while. UPD. I killed the Netherim. And the next final boss as well. I couldn't get to the additional boss because without the hammer, I can't get to the island where the Rune Axe and something else are located. I still haven't found the hammer.)) I just can't remember where I got it in my previous playthrough.))