Necropolis – “Misfortune never comes alone” [Campaign 2 – Mission 1]

I'm playing on the normal difficulty level – it's going well (another example of the developers of Heroes 6 creating unnecessary complexity; why didn't they like the existing difficulty levels?). So far, no problems. After capturing the first Castle, I immediately built a Hall of Heroes and hired two heroes, transferring all of their army to the main hero. Anastasia cleared the territory of neutrals, while the second hero gathered resources. I upgraded the main hero with Logistics, the "Desiccation" spell, and Tactics. I divided the Ghouls into five stacks: four with one unit each, and the fifth with all the remaining units. During the battle, the four small stacks protect the Skeleton Warriors and Spectres, and I cast "Desiccation" on the fifth stack and send it into the attack. This spell, combined with resurrection using Spectres and Necromancy, was enough to defeat all the neutrals with either no losses or minimal losses. Before attacking the second Castle, I built an Altar of Eternal Enslavement in the first Castle, and after capturing the second Castle and building a Portal in it, I teleported back to the first Castle and bought all the fallen units. After that, I easily defeated the two heroes that emerged from behind the gates and am now slowly clearing the territory behind the gates.