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Exactly why did Dracula did everything? It turns out that he was just a human crusader tactician who lost his wife to a terrible illness, causing him to take revenge against God for killing his wife by renouncing humanity. The Power of Love played to a really tragic degree... and talk about Cry for the Devil!
Grimoire of Souls reveals that even though he doesn't really want to, he is unable to truly rest in peace, as his Deal with the Devil is permanent, and he is seemingly forever stuck as the embodiment of humanity's capacity for malice. Unless humanity is completely purified of it's darkness, which is technically impossible, Dracula will keep coming back, meaning he can never truly be together with Lisa.