Undead Servants are the effects of Persephone authority that she obtained from the myth of her as the wife of Hades and the Queen of Underworld.
How would Hecate have this authority?
Well, in the Myth. Hecate is described as her attendant especially on the part where she rescued Persephone as her protector. Then as the guide that leads her back to Earth and Underworld during the spring and winter which symbolize the cycle of life and death, the fertile period and the harsh cold period. Which made Heacte also a helper or assistant of Persephone.
This myth gives Hecate the power to borrow Persephone authority due to their close relationship in the myth.
The Undead Servants is a powerful necromancy power that belongs to Hades that was later shared to his wife and borrowed by Hecate. Leo slayed Hecate and due to Pandora's generosity and favoritism, granted Leo not one but all of Hecate's authority which would be impossible but were made possible with the agreement of Hecate herself.
This particular authority automatically converts his felled opponents into Undead Servants. Leo can choose not to activate it if he wants and it does not work on the divines like Gods. However, it had worked so far for demigods like Campione, Duke Voban and then the newest additions, the Devils.
Duke Voban was left in his original world by Leo to ensure the world still had a capable protector. As for the Devils, Leo didn't really have anything in mind for them. His people are already adequately protected by Ophis and the numerous cloaking and presence concealing magic he placed around the floating land that not even Great Red noticed the new group of neighbors in the Dimensional Gap.
When Leo was constructing a house, he thought of being self-sufficient and creating a farm since nearly half of the land is fertile land with dark green grass covering it. Then he thought, why not use those Undead Servants as a labor force for his land. Not that they could refuse his order or even defy his will.
Thus began the life of the former mighty Satans as farm workers. The farm they work on is not any normal farm or the self-sufficiency part would be impossible to achieve since there is one literal dragon with an appetite that is insatiable.
The crops were magically accelerated and reduced the ripening time from months to weeks. The lifestocks were magically mutated by Leo's sick curiosity to be capable of producing numerous eggs, milk, etc around the clock without stopping.
From day to night, they work endlessly, toiling their bodies in the farm. Tending to the crops and the animals.
"Ugh… kill me. This is the greatest torture ever inflicted upon me." The bald head Satan cried with tears, wanting to take his own life to no success as his body seized up and moved on its own to continue working despite his own mind resisting it.
"We are dead, remember? We can't even die." The green haired Satan sighed as he carried a large crate of fresh grass and brought it to the lifestocks enclosures which the black haired Satan and former Magical Girl took over and fed the cows and sows.
The bald head Satan didn't reply and only sighed as his legs moved on their own and headed toward the field where the crimson haired Satan and a group of Ultimate Class Devils were working the field.
"What would our fate be now, Ajuka?" Serafall asks with longing to meet her beloved So-tan clear in her face.
"Nothing. I tried every way to break free or disable this power inflicted on us. But even the mere thought of it is impossible. There is no way for us to break free from this binding on our soul." Ajuka replied with indifference in his tone. He is neither liking or hating his new fate as an Undead Servant.
"Even so, we are lucky that he honors his words despite there being nothing holding him back from literally wiping out the rest of the Devils." Ajuka said but received no reply from Serafall as she is gloomily feeding the animal more magical grass.
It's a bitter pill to swallow when they learn all it takes for Leo to end the entire race of Devils is just a single authority he can use at whim. They saw the true power he wields when he was training with the Dragon God Ouroboros. He was holding back quite a lot when killing them because his attack can definitely erase half the Earth if he so desired.
Seeing that Serafall isn't in the mood for more talk, Ajuka signed and returned to the large patch of field filled with half a dozen grain crops.
"Damn this accelerated growth. Even the weeds grow like they've been watered with concentrated steroids." The green haired Satan grumbles and returns to his routine of plucking weeds.
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With Sirzechs Lucifer.
Sirzechs are also tending to the field way larger than Ajuka's with a group of Devils. To him, this manual labor is nothing. Not even tiring with his Devil constitution and now added with his Undying body that never tire and hungry.
"You know. I never realized farming was this calming. No paperworks, no more dealing with the Pillar Clans mess or dispute. Nothing." Sirzech said while wiping his nonexistent sweat as he looked at the field free of weeds with satisfaction and pride in his face. "It's almost like meditation."
But a hint of frown appears when he looks at the other end of the field as weeds start to grow tall up to a meter long already.
"I actually second that." A Devil wearing clothes stained by dirt said. "Dealing with the mess made by those noble assholes is exhausting."
"You too huh, Okita." The red Satan said while nodding his head, understand what his subordinate and peerage member felt.
"Yeah, it reminds me of my time when I'm a kid, way before all the Shinsengumi stuff." Okita said with a nostalgic tone as he reminisced about his childhood and hometown. "Also, it brings me joy imagining those nobles shitting their pants trying to take after your place."
"Me too. Hahahaha." Sirzechs laughed with a liberated feeling.
"Get back to work, you two."
A pair of hands knock the head of the two Devils slacking on their job. They turned and saw the irritated face of Grayfia. Sirzechs is the first to tuck his tail and run, not wanting to suffer his wife's wrath.
Okita felt sweat drenching his back as he unconsciously gulped and turned to his back to see Grayfia.
"What are you looking at?" Those weeds won't pluck themselves off the field. Others are working tirelessly and here you are slacking. Get back to work!" Grayfia growled.
Okita didn't utter a word and chased after his master to give him a piece of his mind for fleeing alone.
Then Grayfia sighed. She blamed her inborn instinct to serve. It's a trait of most Extra clans like her Lucifuge clan due to their purpose to serve the Lucifer clan. After becoming an Undead Servant, her soul is bound against her will to serve her new master unconditionally which messes with her mind and causes her instinct to intensify, making her want to serve her new master Leo wholeheartedly even though not as a maid.
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