Increases the Attack and Defense skills of any Vampires or Vampire Lords for each level attained after 4th level.
10% of enemy creatures killed are resurrected (5 % in HotA) Horn of the Abyss.
Gives control of the ballista, defense towers and the cannon to the hero. The ballista has 50% chance to inflict 2x damage. The cannon inflicts additional damage to fortifications.