Generally, there are many demonic cultivation techniques at the Martial Dao Sacred Land that involve the Swallowing Technique of essence blood, but none offer such exaggerated improvements, and they come with several other requirements.
For instance, there's a technique called the "Mysterious Yin Demon Art," which differs by just one character from the "Devouring Dark_Demon Art."
The "Mysterious Yin Demon Art" is a widely circulated demonic technique at the Martial Dao Sacred Land, and any Demon Cultivator there with the intent can practically obtain it.
The Mysterious Yin Demon Art typically uses the Swallowing Technique of virgin maidens' essence blood for cultivation, but the improvements are far less exaggerated than the "Devouring Dark_Demon Art." Moreover, if the woman isn't a virgin maiden, even if she's young, the technique has no effect.
