Travel through leukocytes, take over the immune system at the beginning, and kill like crazy!
White blood cells have a short lifespan. If you want to live forever, you can only let everyone donate blood. After all, donating blood is glorious and love knows no bounds. Don't feel wronged.
My majestic blood refining ancestor, you want me to be moral? Who can talk to me about interests?
No joke, the ancestor passed down the blood refining technique just in the hope that the blood alchemists can work with the ancestor to create a path to immortality. It is definitely not for the purpose of enriching the blood refiners. For slandering the ancestor like this, the ancestor is very angry and the consequences will be serious!