Haku Haku no Mi

The Haku Haku no Mi is a Paramecia-class that allows its users to command spirits of those they've slain, either directly or indirectly, using themselves as a medium, and to an extent — additionally command the spirits residing in everything around them, acting as mere extensions of one's body. This turns them into a Ethereal Body Subordination Human (幽体隷属人間, Yuutai Reizoku Ningen).

Its current user is Genevieve Aruceid, whose mastery of the fruit's gruesome power — turning spirits into her personal soldiers to fell her enemies, increasing her ever-growing spiritual army, earned her the title, "White Spirit General" (白霊将軍, Hakurei Shogun).

Appearance
According to Genevieve, the only thing that should remember about the Devil Fruit is that it looked like an egg-shaped flower with various will-o-wisp patterns etched on the petals; the center looked like a combination of yolk and jello, and was a darker shade of yellow in coloration. The fruit opens and closes if you connect the petals together, truly looking like an egg; she consumed the fruit whole by closing the petals and keeping the yellow-based substance on the inside, which commented had a slimy and gritty texture despite it going down easy.

Trivia

 * According to the author, as Genevieve is based on Winter Schnee from RWBY, her powers are based on Glyphs — the Schnee Family's Semblance, something the former is skillful in employing.
 * The term "Ethereal Body Subordination Human" refers to an article the author did on Fairy Tail Fanon, serving as the inspirational source for this article.
 * If anything, the powers of this fruit is reminiscent to, specifically the various ways its used in the anime/manga series, Shaman King.
 * Kaisei states that this Devil Fruit, the, the Shini Shini no Mi, and are the only Devil Fruits that can manipulate aspects of the afterlife naturally; this, in turn, has some effect on both their body and soul — granting them greater longevity.