Eris listened closely to the burning war inside her body, but that rumble only grew stronger with each passing second. Using Amaterasu's divine magic to heal people tickled her murder portfolio, and it was slowly consuming her mind.
Whenever she heals someone, she can only think about how nice it would be to just strangle and murder them, open their wounds, cut their guts open, and spill their blood on the cold ground. Her vampire blood agreed with that notion, which made Eris's blood urges surface once again after suppressing them for months.
Murder wasn't such an easy thing to tame- vampirism was just as tricky, but having them both working together to drive her mad was far beyond what any mortal mind could hope to endure.
Her draconic side, on the other hand, was quite helpful, giving her body enough strength, will, and arrogance to resist the urges. She had the blood of a great dragon, so how could the pitiful portfolio of murder change her very ego?