Inferno tactics.

I also disagree that Inferno is weak; it's just more challenging to develop on Impossible difficulty. And as everyone knows, the strongest army is the one with the most infantry. Archers have weak stats and low health. Flying units are also slightly weaker (or more expensive). But ground units are just right. It's true that clearing territory is inconvenient, unless you use the hero Pirre (with Ballista and Logistics). I also liked the hero Nimue (Offense and Armor). I often played with this faction and frequently carried only 6th and 7th-level units (because I had little money).