Thanks for the advice – giving it away isn't my thing))).
Hmm, almost the entire map can be cleared on Darkness (slow/subdue and berserk with blind) + summoning (wall + phoenix to finish off the dragons quickly) + ... the main force consists of 14 Imps with Blood Dragon Potion)). 42 spell power (with artifacts) makes Chain Lightning and Arcane Blast just free Armageddon. (The only difficult part is the start and until you get the Blood Dragon Potion).
P.S. I just can't break through 3 armies of Water Elementals (I guess I need to go in with thicker units – I'll leave it for later – I've reached level 32 (with chainmail armor)...