The blood of all vampires
During the fight with Hilston, Arthur gave everything he had. He had used his full strength, speed and skills when fighting, on top of that, he even used his shadow. However, there were a couple of things he still hadn't used, and never thought he would need to.
The first being blood skills, using blood skills required Arthur to consume human blood and that was something he didn't want to do, so he had held back on that so far. Other than that, there was the blood weapon that Arthur always kept on his back, made from blood crystals of fallen vampires, and also the blood armour.
"Is that really the blood armour Arthur is wearing?" Fex said as he couldn't keep his eyes off the armour for some reason, it was as if something was drawing him towards it. "It looks exactly like the one the king wears, it's the same as the one in the pictures from the books I read!"