Warlock – “Cultist” [Campaign 4, Mission 3]

I captured the South and Lower Outpost with Agrail, and sent Shadia to the teleport in the northern castle. In one week, I captured 3 castles. I didn't gather resources; I immediately went on the attack. There's no need to exchange heroes for troops. At the beginning of the second week, I destroyed Inferno with Agrail. It works.