Terminator is right; there's obviously a bug with that Fire Fury spell. Regarding the hero, I don't see any reason to give up on Krag; in my opinion, he's a very good choice. Together with the Devil's Strike and Stun attack as the first move, you can immediately take down 5-6 dragons and also gain an advantage on the initiative scale. Tilshek is also very good, though. If the dwarf doesn't fight to the last, then I don't see any particular problems! Of course, a lot depends on the skill of both players, but the orcs have a good chance of winning. Regarding the game tactics. If you play as Krag, it's wise to constantly control him manually and attack, preferably high-level units and those that are about to move. Trappers try to place a trap in the path of the bears or berserkers. Free Cyclops can be placed somewhere in a corner, away from all your troops (just in case); they are quite wild. And run forward and attack the dwarves with everyone. It should be noted that due to the resurrection rune, it is necessary to finish off, for example, 2-10 ranged units before their turn, even if you want to do something seemingly more useful. Constantly monitor that the dwarves don't use the rune effectively, allowing them to attack all neighboring orcs, each time unleashing a chain of lightning, because this attack instantly wins the battle.