Heroes of the Academy - Academy

The best hero in the Academy is (I don't remember the exact name, it varies in different versions) either Hafiz or Hazif... Anyway, he's a Gremly specialist. He appears, and there are already about 90 of them. You can hire more in the castle and take them from another hero. So, on the first day, you have about 120-130 Gremly. Plus, a Ballista, with the Combat Machines skill. By level 5, the Ballista deals significant damage, so playing with him on smaller maps is the most sensible option.