Inferno tactics.

Recently, I was playing as Inferno (see the story about the Fatum map). This race can be strong if you quickly build up Efreet and Devils, upgrade them, and learn advanced spells: magical support is very important for Inferno! The "lesser" troops are quite weak, but Imps and Cerberuses really run around fast :), and the ability of Imps to steal mana from opponents can be very useful. I never got into Demonology (it's tedious!), but you can still fight well without it, especially when heroes have fire magic, berserk, blindness, bloodlust, curse; earth magic is also a must-have: slowness, shield, resurrection...