he best ability in each category equal to the total clan size is the best way of maximizing attack and defense potential. Below is a long-term list of how much the best offensive ability, Superior Horrific Transformation, will cost in blood upkeep.
1 Superior Horrific Transformation: 300,000
25 Superior Horrific Transformation: 7,500,000
50 Superior Horrific Transformation: 15,000,000
100 Superior Horrific Transformation: 30,000,000
250 Superior Horrific Transformation: 75,000,000
500 Superior Horrific Transformation: 150,000,000
It's best to wait and purchase plenty of minions until the blood upkeep is satisfied before upgrading or purchasing improved abilities.
Read more at Suite101: Vampire Wars Improving Offensive Abilties Guide: Improve Vampire Wars Offensive Abilities for higher Attack / Defense