New era.

You clearly have some mod/map that replaces the original Zehir's file, which is why his specialties basically don't exist, so to speak. The best solution is to just keep only this campaign among the maps on a completely clean game.

I tried removing everything I had downloaded before - it didn't help, I'll reinstall if I can't get through it this way) this time I focused on just Freyda, killed the green one in the citadel without losses, only lost the elves, and screw them, I use them as targets for enemy shooters, it works)
I took out the red one with Freyda in the citadel too, there were 55 paladins, 9 remained) and 100 crossbowmen remained. Didn't manage to gather enough angels. Lost everything else, didn't even buy the Griffin building. Ideally I could have taken him down with Arantir with minimal losses, but I wouldn't have made it back in time turn-wise, I was using him to take territory before the external garrisons, cleared the whole center, but overall I have a slightly earlier save, if I can't beat the purple one, I'll go back. Not working out with the purple one yet) the hero moves way too often, considering I have Expert Sorcery, and he moves 3-4 times while I move twice (the hero, I mean). And with the overbuffed luck they're really something, this time I'm having no luck with artifacts at all. Last time I had the Necromancer's Cloak and their staff too, a ring for -2 luck, but now it's just one HP and magic resistance on the map)) built catapults by the way. All heroes show medium difficulty, but it's not working out with Arantir yet, I don't think it'll work with Freyda either, only if I manage to take down the ballista on the first turn, and that's not guaranteed. The ghost apparently forgot how to dodge by the way 😂 they dodge 20% of the time in battle with him) even the little vampire doesn't help them survive. Using Banishment of course) I'll probably go back to the old save, by that time there will be 100 paladins, which I think might help take him down, since right now there are 45. With no losses and the next growth it'll be exactly 100.
and who comes after the purple one?)

Added after 11 minutes

I tried removing everything I had downloaded before - it didn't help, I'll reinstall if I can't get through it this way) this time I focused on just Freyda, killed the green one in the citadel without losses, only lost the elves, and screw them, I use them as targets for enemy shooters, it works)
I took out the red one with Freyda in the citadel too, there were 55 paladins, 9 remained) and 100 crossbowmen remained. Didn't manage to gather enough angels. Lost everything else, didn't even buy the Griffin building. Ideally I could have taken him down with Arantir with minimal losses, but I wouldn't have made it back in time turn-wise, I was using him to take territory before the external garrisons, cleared the whole center, but overall I have a slightly earlier save, if I can't beat the purple one, I'll go back. Not working out with the purple one yet) the hero moves way too often, considering I have Expert Sorcery, and he moves 3-4 times while I move twice (the hero, I mean). And with the overbuffed luck they're really something, this time I'm having no luck with artifacts at all. Last time I had the Necromancer's Cloak and their staff too, a ring for -2 luck, but now it's just one HP and magic resistance on the map)) built catapults by the way. All heroes show medium difficulty, but it's not working out with Arantir yet, I don't think it'll work with Freyda either, only if I manage to take down the ballista on the first turn, and that's not guaranteed. The ghost apparently forgot how to dodge by the way 😂 they dodge 20% of the time in battle with him) even the little vampire doesn't help them survive. Using Banishment of course) I'll probably go back to the old save, by that time there will be 100 paladins, which I think might help take him down, since right now there are 45. With no losses and the next growth it'll be exactly 100.
and who comes after the purple one?)

Well, overall I understand I'm already close to the finale. Killed the purple one, the brown one, and the red one. Stopped there for now. Killed them all with Arantir, the first two with 120-40 ghosts + a bunch of miscellaneous neutrals, like trappers, gargoyles, orcs, etc., just used them as meat. Killed everyone with the phoenix and the dragon. Killed the red one with obsidian golems and also a few different units. Cast Confusion, then used Berserker to kill all the elementals, and took down the phoenix with the phoenix and the dragon) and Freyda with the main army probably won't even be needed, Arantir's dragon and the phoenix under Vampirism turned out to be a brutal imba, and the dragon has it built-in, and it's not mentioned in the description. You can basically take everyone down with no army at all. I hadn't used the dragon before and summoned it completely by accident, because in the previous campaign the dragon was weak and I rarely used it, but here it turned out to be imba. The funniest thing is that Freyda wouldn't have killed any of them with her army, well maybe she could have handled the brown one, and that's it. 160 paladins, 500 crossbowmen, 25 angels, 100 elves, and the rest don't matter. Freyda is level 29, Arantir is 31. I think I'll take down the rest with Arantir too)) and what's the dungeon for in this campaign? I kept thinking there's a Town Portal with a way to get up top, but as it turned out there isn't, I cleared the whole dungeon except for 4 stacks, level 26, the army is already big, just standing AFK)) or will it fight in the finale?)