Vampires had different abilities, which they called gifts, or sometimes cursed. Their abilities were always been a double-edged sword; it could be harmful to them if they didn't handle it well. However, aside from that common fact, a vampire's ability had its variation and stages.
It was hard to guess a vampire's ability since most of them learned to hide the real nature of their abilities. Others, just like Zero, would go so far as to make his ability appear different from what it truly was.
Diversion had been a great war tactic. Therefore, one couldn't just fight with everything they have until they uncovered a vampire's ability's real nature.
