Play against Necropolis.

Well, I don't know... IMHO, defense is unnecessary. The Stronghold has Rage, but its HP is low... So, what's the point of defense? As long as Rage is active, Orcs barely take damage from each other, and when Rage disappears, defense won't help much anyway (again, they have low HP)... And a cap is a good thing, although there is a risk.