Necropolis vs. Dungeon

I would advise you to take, if you're lucky, the "Soldier's Luck" skill. In this case, the Vampire Lords are simply killers. Increase attack in the dwellings. And considering luck, quantity, attack skill, and combat frenzy, they deal very good damage. Spellcasting - protection of undead from magic - is also desirable. Definitely take "Spiritual Link." It's just an unfair advantage. Take racial skills as early as possible, as well as logistics, so you don't fall behind the Warlocks when clearing the territory (spiritual link also contributes to this, as it provides a constant source of mana with a large army). As for magic, probably "Summoning." Some advise upgrading both "Summoning" and "Darkness."