Idenisis

Idenisis is a strange, metaphysical curse upon the blood of a mortal of practically any lineage, which turns them into an Idenite, or Child of Blood. Depending on the strain, the condition entails different effects, though common among them is the ability and need to consume life to sustain themselves. Some strains grant immortality, others a command over blood, and some shape shifting abilities. They all have some form of drawback though, many making the idenite highly vulnerable to direct starlight. The way the curse is conveyed is also dependent on the particular strain.