Promises Made.

The most important promise he made to them was that he had to do his best to help them become true gods in a year after he reached their world. That's why he had to share his blood with them and turn them into vampires, even though he knew that they would eventually come for his life after he did so.

He tried to delay the inevitable by telling them that he needed a lot of blood to help them. During that time, because they thought he was helping them, they helped him turn other Kunuts into vampires and hunt other races for their blood.

Most of the blood he has acquired was provided by the demigods. It would have been good for him if things had continued like that.

Unfortunately, things couldn't continue like that forever. When it was almost a year on this planet, he had to tell them that the only way for them to become true gods was to kill him and replace him.