Voldemort: the Conqueror. He rules the Wizarding World.
Amaxintha: the Dark Queen of Atlantica. She rules the oceans and all of the sirens, and merfolk.
Elen: the ruler of the phantomlands. He hates Voldemort with a passion. He rules all the elves and fairies.
Crescent: the rebel factions who does not belong to Atlantica, the phantomlands, or the Wizarding World. Led by the elemental users.
Greater Good Army: this was the group of Albus Dumbledore and Gellert Grindelwald. They sought to rule over the muggles. They wanted the power of the Deathly Hallows. The Marauders, led by James Potter, knew about the Deathly Hallows and stole the resurrection stone from Voldemort and hid it in their vaults. Then there was a prophecy about Harry being the one to vanquish the dark lord. The problem was, they didn't know which dark lord the prophecy talked about: Voldemort of the Wizards, Crescent's nameless leader, Elen of the Phantomlands, or Amaxintha of the oceans. So the Marauders hid the prophecy and simply made the infant Harry as prepared as he could be- they had Kieran (aka Satiate) to protect Harry, and also teach him. Kieran owed Sirius Black a life debt, and so the Marauders used that to bind Kieran to Harry. The Marauders also sought to activate all of the abilities that the Potter bloodline has- the Magic Sight from the Potters, Intent from the Blacks, and Healing Power from the Gryffindors. They had also activated abilities they did not actually want: Child-bearing, Necromancy and Veela's wings and allure. Child-bearing would ensure that he was submissive. Necromancy would be scorned by the public, and Veelas were associated with the phantomlands.
Later on, Peter Pettigrew outed the Marauders to Albus Dumbledore so his life could be spared- he told them that the Potter child was prophecied to Vanquish Gellert Grindelwald of the Greater Good Army (a lie. But Peter was a master at lying, and Dumbledore was too anguished to see through it).
Dumbledore hunted the Marauders down, killing Sirius Black, the father of Orion Hunt (aka Eat), in secret. Dumbledore and his army killed James Potter, and was about to kill Lily, when Lily sacrificed her life for a ritual to bring him and his attacking soldiers down. To ensure that her son is unharmed, she put the Middle rune on Harry's chest. In the end, Dumbledore was turned to ashes. When the aurors came, all they saw was a manor that looked like it was bombed, with every part of the house lying far away from where it should've stood, crying Greater Good soldiers kneeling out the gate, Harry playing with Dumbledore's wand, and a circle of ashes around him.
Kieran had soon heard the news and took Harry away before anyone else did.
Kieran was a vampire who took lovers left and right, never hid his love for killing, and was an intimidating man in politics, but he did put an effort in Harry's care. He paid a nanny to take care of him and hired tutors for Harry's lessons and helped him control his various abilities. Kieran also attempted to keep the secret that Harry could bear children. However, when Harry got badly hurt at Hogwarts for Quidditch, the mediwitch exclaimed loudly about it turning up in her scans, saying that Harry should be honored. Thus, the whole school found out.
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Army of Eight: A group that works for Voldemort that is made out of Modmen (Modified Men).
1. Ravenous- Harry James Potter, the leader. A wizard who specializes in bending magic to invent all kinds of machinery and modify living beings due to him being the only user of Magic Sight alive. He modified the other members. He is the boy-who-lived, man-who-conquered, and the immortal master of death. He modified himself to be able to handle large amounts of magic.
2. Satiate- Kieran. A former high vampire who was modified to have the ability to be akin to a black hole: he can suck any kind of matter inside him and can spit them back out. He is Harry's mentor in politics, manners, and dueling.
3. Eat- Orion Hunt. A former werewolf teenager who had anger management issues. He had been modified to be able to become the biggest, strongest, fastest, and fiercest werewolf. He can heal his wounds frighteningly fast and can turn into a wolf with his own will. He can also control other werewolves due to his dominance. He is also called the Werewolf King. Harry had once saved him from death, and was the first Modman.
4. Consume- Rabastan Lestrange. A former dark wizard who favored the fiendfyre curse so much that fiendfyre... Favored him. He was modified to be able to turn into a man made of fiendfyre. He can fly and throw fireballs and make fire tornadoes.
5. Devour- the last name he had taken was Julius. A former flesh eater who was modified to be able to control anything and anyone's body by exploding and using his black particles. He is also called the Army Eater, known for devastating entire armies in one full swoop.
6. Ingest- The second Greengrass daughter. She is a master of potions and politics and is modified to be able to have psychic control over her potions and other people. Also called Lady Malfoy.
7. Gorge- formerly an assassin from France. She was modified to be able to copy a person. She is an extremely fast metamorphmagus who can not only copy how a person looks like, but copy memories, emotions, and abilities as well. She is the only metamorphmagus who can copy everything and anything, even magical creatures.
8. Binge- formerly a lowly vampire who was modified to transform into anything using bones. He can grow exponentially and control them in different ways. He usually favors being a white flood, a gigantic flying bird, a giant white skeleton, a moving castle, and a moving white tree.
The Outer Army. the group of people under the Army of Eight who assists in non-combative ways and trains the lower death eaters.
1. The Green Man- Neville Longbottom is the head of the Interrogation unit. He is a master of torture. He was modified to have a fuller control over his plants. He uses plants to cover himself and uses them for defense and offense.
2. The Seer- Luna Lovegood. She was modified to see visions that are seconds away. She was the hardest subject Harry ever had to modify, and in result accidentally managed to make her magic weaker.
3. The Red Spy- Ron Weasley. He is so normal he can fit in anywhere. Harry modified him to be able to stay unnoticed whenever he wanted. Head of espionage unit.
4. The Owl- Hermione Granger. She can turn into a barn owl and is clever enough to get into most secured places. She is modified so that she can swallow anything and spit them back out.
5. The Weasley Twins- they make weapons for the death eaters, make things that Harry tells them to make. They were modified to be able to multiply.
6. Oliver Wood- trains the death eaters. He was modified to be able to copy every fighting style there is.
7. Viktor Krum- also trains death eaters. He is also a master of runes. He was modified to be able to complete any ritual at an instance.
8. Bill Weasley- a curse breaker who also trains death eaters. He is the best ward breaker in the world and he was modified to also have Magic Sight like Harry.
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Harry is an outstanding fighter.
When he goes all out, he completely decimates most beings in the world. They say that he is so good at fighting, that only gods and demi-gods can survive it.
He is a powerful wizard with a knack for powering multiple spells all in the same time.
First, the second he locks his eyes on your form, he will suck on your magic and transfer it to himself. This would be notably painful for magical creatures whose molecules of their limbs are in fact bound to magic itself. Like dragons and their magic fire-forming guts. (Wizards don't have magic-bound limbs, they just have a core inside them that can generate or attract magic. They can give away as much as their core can replenish.)
Most people die or give up after a few seconds at this point.
Second, he quickly casts two chains of deadly spells that bounces everywhere, creating highly unpredictable attacks.
Third, a shield that bounces back most spells.
Fourth, he changes the environment you are in via illusions, transfiguring the landscape, and basically bending the laws of reality like gravity, time, and space; lastly, he throws his weapons at you- bombs, potions that induces all sorts of things, pranks, etc.
Fifth, he then makes an army of golems made out of the ground. An army that will beat you to a pulp if you let them come near you. And if they can't beat your skills at physical combat... They explode.
If you are still alive at this point, then you would be the lucky person to see Harry Potter engage in physical combat, with hardened body and increased speed.