"Give me strength, O master! A drop of your Essence Blood will be enough." The Black Sword roared back.
Seeing the rapidly incoming half-castle size magical mace, Donghai didn't make a second guess as he forced out a golden drop of blood from inside his heart, spitting it into the black longsword. It was quickly devoured by the luster black sword.
Bzzzz! With a buzzing sound, it talked to its owner, telepathically: "O master! Swing me with whatever sword martial techniques come to your mind. Just simply swinging will do the trick, but at the end of the day, how much sword power I could execute depends on the sword master's skills."