Chaos structures.

Without a doubt, the Night Terror Hydra - Champion Dreadnought is the optimal choice. Night Terrors have ranged attacks + poison, Dreadnoughts have terror + decent combat skills, and the Champion Dreadnought has magic immunity and is a strong warrior. Hydras are significantly weaker than dragons. Therefore, you shouldn't skimp here. Even if you don't have sulfur, you can always trade for it (there's a wonderful thing called the Market :) ). The increase is small, but it allows you to accumulate resources and money, and you'll have the strongest unit in your army :) The only unpleasant thing is when the Champion Dreadnought kills its own warriors along with the enemy, but you can live with that if you play carefully :D

and it's very difficult to kill ranged units and mages with them!

Because the damage they take is huge. Especially from Barbarians and Nature faction heroes with ranged attacks :cool: