"What the hell is happening?" Casemar asked himself as he felt his body become weaker than before.
Without him even realizing it, when Lostred had sent the spike made out of acid, he had already managed to infect him. Casemar believed that the acid would start burning the outside of his body, but that was not the case with how Lostred had used it.
He had used it in combination with his blood manipulation, he mixed his blood with the acid and created the spike, then, when the spike managed to graze Casemar, he manipulated a part of it inside Casemar's body without the latter noticing it.
He slowly released the acidic poison inside of the blood that went inside Casemar's body, making it very difficult for the latter to notice it. That was only further made easy because of the acid that stayed on the flesh of Casemar's body, the one he had quickly suppressed and destroyed with his dark energy.