Nelson

Jack Nelson (ジャック・ネルソン) was an acting archbishop who's secretly a member of the Cult of Diablos, being the 11th seat in the Knights of the Round. He was killed by Shadow.

Appearance
Nelson is a bald old man with little to no changes in his appearance when compared to the past him in Hero Oliver's memories. The only notable difference is that he has lost his hair overtime, allegedly due to stress where he was always being called as "Baldy" by Alexia Midgar.

Personality
To the public, Nelson presented himself as a humble and benevolent archbishop who takes joy in his duties. However, there are times when his true personality came to the service. He was also shown to be perverse, easily giving up vital intelligence when Beta seduced him with her body.

Like many high-ranking members of the cult, Nelson is a delusional psychopath completely convinced of his invincibility. When pushed into a corner, however, he underwent a villainous breakdown, repeatedly trying to justify to himself why he was losing.

In the anime, Nelson gives the impression of a hard-working person, such as complaining at every opportunity and being confused by Alpha's behavior when she tries to retreated during the battle. He also possessed a severe superiority complex, claiming to have gone bald from the stress of having to deal with his "idiotic" comrades and being forced to work because of his immortality.

Background
Nelson was the original member "Knight of Rounds" of the cult, around the time since Diabolos about 1000 years ago, and at that time he was involved as a scientist in researching demonic possession and Diabolos' left arm, and eventually was in charge of inventing the production of the "Tears of Diabolos" creation research and their derivatives, since the establishment of the Cult.

Nelson was a 11th Seat Knight of Rounds from the Cult of Diablos, also named himself as the Avaricious. Every year, he takes a drop of "Tears of Diabolos" to maintain his strength and immortality. Nelson and his faction operate in the Lindwurm. Ten years ago, He has a subordinate called Venom the Executioner (possibly after he called Olivier when the "Goddess's Trial" event).

Nelson tasking Venom to killed the Archbishop Drake by the Cult's order because his dark rumors had reached the royal capital, in order to erase the evidence from Princess Alexia and the Crimson Order before they arrived in Holy City Lindwurm and trying to investigate him, in which making Nelson was appointed to be an acting Archbishop to host the "Goddess's Trial" event. Nelson then conducts an audit with Princess Alexia, explaining that she was there to investigating the previous archbishop death, which he replied that the church will be handling the investigation and already send the letter to the king Klaus Midgar.

Holy Ground Infiltration
Nelson hosting the "Goddess's Trial" until the end for last challenger named Cid Kagenō to show, only to find Shadow appear at the stadium surprising the audience. Nelson order his men to gather the Church’s Holy Knights to surround Shadow, until he shock as he didn't activate any summons and saw the figure of ancient warrior known as Aurora, the Witch of Calamity. Nelson states to the princesses and miss Natsume Kafka that Shadow is unfortunate to summon her as she is the most powerful witch in all of history. Shadow and Aurora only face each other until they start fighting, as he commented that Shadow is just observing and dodging all of Aurora's attacks and surprisingly defeats her with a single slash. Nelson watch Shadow decide to leave after shocking everyone, until the barrier breaks and a magic door suddenly appears in the middle of the arena.

He startled and wonders if the magic door is responded to Shadow and worthy enough to pass through the Sanctuary. As the door starts opening, he gives orders to evacuate the citizens and cancelling the trial. Nelson then tries to make Alexia and the rest leave, but Shadow Garden appears led by Alpha and asks the princesses to not do anything until the door is closed and then enters the door. Epsilon had defeated Nelson's guards and states he will be coming with them inside the gate, but he refuses and calls his guard Venom to kill Epsilon only to sees Venom have been cut down. Epsilon then asks Nelson if he saw anything, he states didn't see anything and then grabs him and jumps into the door, taking Beta (posing as Natsume Kafka) as "hostage" and suddenly Princess Alexia and Rose enter the Sanctuary.

The group follow Alpha as she explains that the Sanctuary is the place where the hero Olivier cut the Diablos left arm and they sealed it in Lindwurm. They came to learn more about the Cult and its goal, but knowing that Nelson won't talk so they decide to see for themselves as Alpha points at a statue of the hero Olivier that looked like a woman, surprising the girls to which Alpha even showing her face, which is the same as Olivier to them. Nelson then realizes she was a possessed, but she wasn't compatible and supposed to be dead. Alpha states they know the truth behind the Three Heroes and the Demon Possession, from which the cult want to maintain the situation under their control, even suspecting that the Cult goal isn't just reviving the demon and states they should proceed to see for themselves by exploring the Hero Olivier's memories.

He pretend to follow the group, while luring them into the Sanctuary Center defense system as the group enough explore the facility and arrived at the Sanctuary center, which they know that the Cult's true objective is to create Tears of Diablos which grants extraordinary strength, as well as immortality with its main ingredient is Diablos cells cultivated from the demon's body and the hero's descendants blood. Nelson then confirming every Alpha guess she had to confirm, until she exposing his true affiliation as a 11th Seat Knight of Rounds, which he confirms by stating that he is Nelson the "Avaricious" and separating them into groups. As Nelson faces Alpha and Delta, he multiplies himself by making copies and stated that they will fell regret for baring their fangs against the "Cult".

Delta started by easily cuts down Nelson's copies, but feels something is wrong as he explains that the closer they are to the center of the Sanctuary, the more of their power is drained, to which Alpha adds that at the same time the closer is Nelson to the center, he gains more power. Nelson was hoping to get them even closer, but states this is far enough to be able to defeat them. Even though Delta is loosing power, she still obliterating his copies, which makes him shocked by her power and the memory starts break. He surprised that over hundred of his copies has been erased, which Alpha states that even if he was able to create a hundred copies, they all still have one brain and he couldn't control them all that well. Then, he calls for Olivier to come and join him, but at the same time the Epsilon's group join Alpha and states they are done with the investigation and can leave. He is surprised that they are running away, but Alpha explains their objective is to cut off the source of power and now know how the Sanctuary defenses work, so they will be returning again.

As Alpha and the rest leave, He starts wondering what to say on the reports to the fellow rest of the Rounds and guesses he will explain to them that he lured them to the Sanctuary in order to expose their identities and with Alpha's blood they can perfect their experiments. Before he leaves, a notification appear and it said that someone is in the Sanctuary's center, which he decide to personally deal with the intruder along with Olivier.

He appears at the Sanctuary's center and only saw two figures, Aurora and the boy (unbeknownst to him that the boy is Shadow) and sends Olivier at them and the boy goes to face her, even knowing that she is quite strong. Olivier attacks the boy and manages to injure him, making him orders Olivier to finish the boy off until Aurora then jumps in and asks him to stop, knowing that no human can defeat Olivier and tell the boy that he done enough. Nelson laughs at her, noting that without magic she can't do anything, but if she agrees to help him, he will spare the boy. But, the boy interrupts them, stating that he doesn't need help and they shouldn't assume he will lose. Annoyed, he orders Olivier to kill the boy this time and she jumps in and stabs him. But, the boy stating he got her while opening his right eye and then grabs her and bites her neck, ripping it and defeating her.

He wonders how the boy still alive after being stabbed and the boy explains that it was easy to survive a stabbing, if protecting the vital organs and arteries, much to his surprised to see that Olivier getting defeated by a kid with no magic. But, He states that she was just a copy and with his amount of magic he have in this Sanctuary's center, he summons countless copies of Olivier. Several of them attack the boy until he opens his right eye and defeats them using his magic, much to his surprised that the boy is able to use magic as the boy explains that he just tempered with the magic until it was too solid to be absorbed which took him some time, but its something simple.

Nelson felt that's not possible to which he did not believe when he heard boy's explanation about the method and orders the Olivier copies to kill him. The boy fights them, but as his wound continues to bleed, he decides to take out all copies at the same time and start casting his ultimate spell "I Am the All-Range Atomic". One of the Olivier copies stabs him in the heart before he finishes the spell. However, the boy is unaffected and finishes his spell and unleashed the explosion to which disintegrated everything inside the Sanctuary, including him.

Powers & Abilities
Being the 11th Seat Round Knight, Nelson was considered the strongest Cultist and also one of the Cult of Diablos executive leader. But, since Nelson was a researcher and not a warrior, his combat power is no more than that of an ordinary magic swordsman. By exploiting the functions of the Sanctuary, it absorbs the magical power of intruders and converts it into its own power, creating numerous duplicates of itself and Olivier to fight.

Magic Cloning
Nelson has the ability to create replicas of himself or another. However, due to the limit of his brain power, he cannot control multiple clones very effectively. These clones are weak when they were easily cut down by Delta.

Shadow
At first, Nelson thought that Cid was just some nobody that got fooled by Aurora into helping her. He did considered letting the boy go alive but then got annoyed with Cid's rude attitude towards him and had Olivier to kill him. Then, he cried out in horror when Cid was able to defeat Olivier and somehow able to use magic despite the Sanctuary's effects. He was killed by Cid's "I Am All-Range Atomic!".

Trivia

 * As a Acting Archbishop, Nelson has to right to command the Church’s Holy Knights.