Awakening of Evil

For now, the main hero is moving along the right side, heading upwards, slowly clearing out neutral creatures, and has taken on a quest to eliminate a neighboring faction. There are 20,000 peasants guarding that territory. The second hero is simply running around, recruiting troops, and upgrading them. He found a fort with 70 creatures, so he'll create Furies and then do something else. Right now, Fire Elementals are proving to be decisive for me, and I also found a Ring of Summoning, so I can summon 70 of them, plus 30 Griffins. If I'm lucky with the map and playing against a larger faction, I'll keep the Furies and use the Elementals to crush them. But I avoid factions with Archers because I don't have Dispel or at least Walls. Once I find those spells, it will be easier. For now, I'm making slow progress; it's the second month and second week, and I'm near the faction I need to eliminate. I hope I'm not falling behind in pace because, as I understand it, this campaign has become much more difficult, but I want to complete the entire campaign with this hero. How are you playing? Personally, I'm having severe mana problems right now, even though I cleared out the Griffins and received 3 knowledge points from completing the level and finding a crystal. Now I at least have 100 mana.

Added 2 minutes later
I took Furies as my starting bonus, but Logistics is maxed out. Unfortunately, I don't have the necessary skills