Dilan's Agility easily crossed 150 Units, which made him the fastest existence on the entire battlefield. Nobody was able to evade his attacks, and even the usage of defensive or attack abilities was of little use against him.
All the Vampires were trying their utmost efforts to defend against Dilan or to attack him using suicidal means but his Health Stat was too high.
Only the areas that were not covered by his skin could be injured, which restricted the Vampires tremendously.
Attacking his eyes would be the easiest out of the few options they had left but even that was not easy considering that a huge greatsword and his speed that was more than that of a tornado unleashing destruction obstructed the Vampires' attacks from working out.