"The Blood Clan's Wings"

Maybe a mix between a single-target ability and a large-scale ability would be good.

Actually, the Godfather wanted Ainsley to take another more defensive ability, but thinking again, almost all his abilities were fatal attacking abilities. 

He specialized in large-scale attack, and Ainsley was also good at large-scale attacks. 

So...maybe it was better to lend her that ability. 

[How about the lightning manipulation ability? You can increase your speed with this ability, and you can scare spirits too.] 

Not to mention that in the Godfather's hands, the lightning manipulation ability would simply be a Godly ability in a large-scale war, even better than the blood manipulation ability. 

[This ability is also good to be used in a one-on-one battle. You also don't need any existent lightning to use this ability and can just generate one out of thin air.]