Vampire's mate
It can be said that A rank is like the king who dominates his race, they easily integrate with the upper class and the royal family of people, controlling people to offer food to them.
Next is the B level equivalent to the A level living in the nobility; food is also human blood and human flesh, the C level is below the B level, self-hunting and self-living with no available supply can only predict the amount of food, awareness, and intelligence is only two levels below the above level. The common trait of the three grades A, B, and C is that they do not lose control because of hunger, they breed pure Vampire generations and try to live like humans without fear of the sun, fire, cross, and g
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