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Soul Essence is the substance that Dhampirs feed on. It is present in all bodily fluids but is most abundant in blood. Sweat contains the least amount of Soul Essence. It is stated that all races possess Soul Essence, whereas higher ranking races have proportionately higher concentration of it. However, the concentration of Soul Essence from races ranked 6th and above ("Life" Ixseeds) are so highly concentrated, the Dhampir will be evaporated if they consume it.
Dhampir magic is powered by Soul Essence. The more powerful magic they use, the more draining it would be. Both the quality and amount of Soul Essence determines the strength of magic they can cast, and they can die if they are depleted.
When Sora and Shiro first meet Plum, he licks the sweat off the bottom of Shiro's foot in order to avoid dying of starvation. After consuming Sora's blood, he was able cast magic powerful enough to deceive Azril, one of the most powerful Flügel during 『 』's game of tag with the flying race.