Arc 1: Chapter 34

Bastian stared blankly, his thoughts spiraling down, but he couldn't find another way to help, it was only a small amount of blood and a fragment of the core, nothing hard to do... Everything is on his hands, so why hesitate?

He then gestured for Martin to hand the crystal,and Martin simply gave it without much thought. Then he asks for an empty vial, which fortunately, there's still one available. He did as the system told him to do, cut a fragment of the crystal, cut a small wound on his own hand and mixed it confidently, he looked like an old shaman creating a cursed poison.

The others watched as the crystal slowly turned into a liquid, as if it was corroded by the blood.

Although the rest trusts him very much, they felt somehow lucky that they had no wound. After all, they were all human, who'd even like drinking another people's blood?