Xavier Remington 
A Mummy is a deceased person whose body is preserved through the Mummification process. It’s a burial ritual performed around the world in various ancient cultures such as the Egyptians. It was often thought of as an important event to be mummified and kept intact for a prosperous afterlife. Thankfully most mummies are just well-preserved humans in bandages that pose no paranormal threat. Although, there are mummies of a supernatural sort that choose our physical world as their afterlife. An unholy resurrection into a life of immortal powers through the dark miracle of ancient magical curses. This mystical regeneration is fueled by the horrifying cannibalistic consumption of live humans! Ultimately these are ritual sacrifices to dark Gods of death who look favorably upon those who still revere them as deities to be respectfully worshiped. Both Mummy, and God partaking of the enchanted essence of the innocent human’s soul!
Zombies Were The Birth Of The Mummy
The metaphysical mummy came into existence after the first Zombies were examined by ancient Egyptians. From this, the mummy’s curse was created. A supernatural safety measure to ensure the sacred bodies and burial vaults would not be disturbed. Such desecrations were thought to impact the afterlife negatively. Powerful Priests, magicians, and alchemists devised the enchanted embalming method that tapped into the zombie virus while intertwined with a carefully crafted curse. When the mummy was disturbed, the curse would channel the metaphysical energies of the ones who discovered it. This would resurrect the sinister spirit from the afterlife. They would then haunt and even attempt to possess victims. All the while sucking them dry of enchanted energy. However, the mummy’s ghost would not have the power to permanently possess another human’s body as it wore the vessel out.
At some point, it must coalesce into its corpse, or return to the afterlife. Their afterlife is the Underworld rather than Heaven or even Hell. Part of the curse was sending their spirit to the Underworld to dwell among the dark Gods and Goddesses. In some cases, the spirit feels it avenged the desecration of their body and grave. Then they simply return to the Underworld. You might ask if this resurrection power existed with ancient Egyptian Priests then why not prevent death, to begin with? Living out one’s natural life, and ascending to the afterlife was the ideal of existence. The resurrection was only meant to punish wrongdoers. However, some mummies see how amazing the world has become, and want to stay. Perhaps they even tire of the Underworld after thousands of years! Either way, the curse must be specific with purpose, and not just a method to keep people living forever. Otherwise, they tend not to work. Especially with these powerful types intertwined at the will of Gods. In fact, the blessing of the patron God is required to continue living here. Plausibly the mummy is fulfilling an Earthly mission for them.
How Mummies Regain Their Human Beauty & Obtain Paranormal Power
Once within its decrepit bandaged body, the mummy would have very little time to begin consuming live humans. The people it had killed as a dark spirit are devoid of the necessary paranormal power so it needed to seek out other victims. Interestingly enough there is very little coherent consciousness in the early stages of mummy resurrection. The staggering walking dead corpse operates on a zombie-like instinct to seek out human, and animal flesh to a lesser degree. With each meal, they regain their intelligence. The dark patron God of the mummy’s curse aids in the channeling of the human’s astral energy into the mummy. This causes some level of regeneration. It is said that sacred numbers play a role. The mummy must consume 21 people to completely regenerate as an immortal human of exquisite beauty. This is complete with enhanced physical abilities, senses, and some degree of psychic powers including hypnosis. They also have various magical protections derived from the original mummy curse.
Seven and three are the sacred multiplied numbers to get Twenty One. The mummy must eat 7 men, 7 women, and 7 virgins of any sex. All preferably youthful yet over 21 years of age. Any consumed kill that deviates from this, including animals, is merely a temporary measure to hold off necrosis. Even after they regenerate, they must continue to consume one virginal human every 7 years to remain youthful, and powerful for all eternity. Mature virgins always seem to be key in various rituals and spells because they possess a unique energy that has the wisdom of adulthood intertwined with the innocence of childhood to an extent. They also have maximum metaphysical energies due to a partner not sapping them away during sex. The virginal feast must be done in a special ritual sacrifice with the aid of a dark priest. Failure to continue the wretched ritual involves their bodies decaying like that of a zombie. Even their minds will start to go as well.
How To Exterminate A Mummy
Mummies are extremely hard to kill due to the dark magic protecting them. However, the simplest way to kill them is to trick them into eating zombie 
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would they have exquisite beauty no matter how they looked as a human after the Human consumption?
They would have the same base looks as they did before they died, and were mummified. However their appearance would be flawless with perfect skin, teeth, etc. Even someone who would be considered below average looking can be considered good looking with flawless skin, lustrous locks, and a glowing smile. These mummies are also hypnotically charming.
If they are a Cousin of Sorts to Zombies does that make them immune to the normal Zombification?
Yes they can be bitten by a zombie without worry of becoming a member of the walking dead. However the wound site will take a long time to heal. This is due to the Mummy’s issue with dead flesh. It thrives on living flesh just as the zombie does. As mentioned eating zombie meat will destroy a mummy.