Official Campaign Edit
Ammon Jerro is one of the major orchestrators of the events that happen in the official campaign. The Jerro family was once the highest of nobility in Neverwinter and at a very young age Ammon showed a remarkable talent for tapping into the powers of the Lower Planes, thus indicating that his powers were not the result of fiendish pacts, but rather something within his heritage. He traveled the realms studying under many masters, including Waterdeep, the Arcane Brotherhood of Luskan, the powers from the Lower Planes, and even as far as the Academy of Shapers and Binders in Thay. Later, he managed to gain office within Neverwinter as their jester mage, often downplaying his true abilities to avoid attracting unwanted attention. He did this in order to gain access to the Neverwinter Archives and to hopefully have some say during state decisions.
During his research, he learned of an imminent threat called the King of Shadows. He warned the council of the threat but many of the nobles were too busy squabbling with each other to pay any attention, so he sought allies elsewhere among the devils, demons, and even the githyanki. He eventually learned from the fallen wyrm Nolaloth that githyanki silver swords are capable of harming the King of Shadows. He traveled to the Lower Planes, where Gith was last seen, and sought the aid of the Still Lord of Baator, Prince Levistus, in locating the Sword of Gith, Gith's own personal silver sword. Through Levistus he also gained an ally in Mephasm, one of the Still Lord's servants. He was able to retrieve the Silver Sword but found no trace of Gith herself. With the devils and demons to aid him in his fight against the King of Shadows, he managed to convince the Lords of Neverwinter to join him in the war. He made his last stand at West Harbor where he engaged the King of Shadow's avatar and fought him to a standstill, each unable to land a killing blow until Ammon was distracted by the cries of an infant (none other than the PC) which caused him to lose his concentration and allowed the avatar to shatter Gith's Sword. One of the pieces from the shattered silver sword plunged through the PC's mother who was protecting her infant and became embedded in the chest of the child, thus setting into motion the events that would later send the PC on his/her quest. The shockwave from the sword banished the King of Shadows back into the Shadow Weave. Even though Ammon had survived the battle, he was immediately recalled to the Lower Planes and spent the next 15-20 years being tortured in the Hells, perhaps as a part of a contract he made with the Lower Planes. Many of his friends assumed he died at the battle of West Harbor and his surviving family moved to Highcliff and lived as simple farmers. Ironically, because of Ammon's association with demons and the lack of records of what transpired at West Harbor, his deeds were forgotten and those that do remember him mistook Ammon as being the King of Shadows.
Years later when Black Garius was researching on how to harness and gain the powers of the King of Shadows for himself, he summoned Ammon back from the Nine Hells in order to learn more. It is unknown what Ammon did after that but it is assumed that he somehow left/escaped from Black Garius and returned to Neverwinter. He hunted for the silver shards in an attempt to restore the sword and along the way rectified some injustices in Neverwinter; namely, he was responsible for the murders of several nobles within the Blacklake District in his quest for the shards. The PC later learns from the sage Aldanon, an old friend of Ammon who believes that Ammon was dead, that Ammon Jerro once possessed a Silver Sword and his research located in his haven might prove useful to the PC concerning the shards. Unfortunately, no knows where Ammon's haven was and their only lead was Ammon's last living descendant, Shandra Jerro (whom they had met earlier on her farm). Ammon later summons a horde of demons and launches an attack on the Githyanki stronghold to claim the silver shards from their leader Zeeaire. Unfortunately, he was beaten to the shards by the PC who was there to rescue Shandra Jerro, Ammon's granddaughter, although unknown to him at the time because he had assumed that all his kin had been killed in the first war with the King of Shadows.
Ammon then sets out to complete the Ritual of Purification, a ritual that was was created by the Illefarn Empire as a way of undoing the King of Shadows. One of the ruins that housed the statue of purification was located near West Harbor. Ammon was able to complete 1 out of the 5 of steps in the ritual (The Web of Purity), and the PC was able to complete the other 4 steps but not the step Ammon completed before Garius and his Shadow Reavers destroyed the other statues.
The PC eventually locates Ammon's haven, but it requires Jerro blood to gain access, thus Shandra was forced to shed her blood to open the door. However, upon entering the Haven, Shandra was separated from the PC and his/her group. As they explored the haven they discovered that a number of powerful Baatezu and Tanar'ri were bound to summoning circles which granted the master of the haven his great powers. When the PC and his/her party meets Ammon in his central sanctum, he attacked them for intruding, intending to claim the PC's shards, and Ammon quickly gained the upper hand. Shandra, who was psychically linked to the haven due to her lineage, saw that her friends were about to be killed by her grandfather. She then learned from one of the fiends trapped there that the warlock they were fighting was not the King of Shadows, but her grandfather. They told her that if she wanted to save her friends she would need to weaken Ammon, and in order to do so she had to set the trapped fiends free by spilling her own blood and disabling the binding circles. The bonds are broken and Koraboros, Zaxis, Blooden, Baalbisan, Hezebel, and lastly Mephasm are set free. Shortly thereafter, Ammon is greatly weakened and furious at who had set the fiends he bounded loose. He managed to track down Shandra as Mephasm was being set free, and started assaulting her with a barrage of spells in his rage. As she collapsed from blood loss and his magic, she apologized to her grandfather for what she did with her dying breath. Confused by her dying words, Mephasm explained to Ammon that he just murdered his own granddaughter in blind rage, and reminded him that only one of Jerro blood could have opened the door to his Haven. As Mephasm departed, the party emerged from a portal and confronted Ammon in front of Shandra's body. Horrified by what he had done, Ammon used the last of his power to teleport the PC and his/her companions to safety as the haven collapsed around them.
Back in Crossroad Keep, Ammon is a bitter broken man, realizing that he had just killed what he had tried to protect when he first waged war with the King of Shadows. Having nothing left to lose, he decides to join the PC in fighting the King of Shadows, as they together had all the parts of the Ritual of Purification. Some time later, he travels to Shandra's farm to look for something he left there many years ago. Before he can find it, Koraboros appeared with vengeful intent, coldly telling Ammon of Shandra's childhood, stating that what he showed him was a punishment he could never inflict upon him in Baator. At that point, the PC and company arrive looking for Ammon, and Koroborus attacks the party and is destroyed. If the PC had high influence with Shandra and decides to tell Ammon of the adventures they shared, Ammon eventually breaks down and shows remorse for killing Shandra begging her for a sign of forgiveness, and at that moment a ray of sunlight illuminates Shandra's pendant that was among the debris of her ruined home. If the PC had low influence with Shandra, Ammon would just casually unlock a box that he had hidden at the Jerro farm and take out a dire mace that he had hidden there years ago.
After the meeting with Sydney Natale, Ammon confirms the Truename Scrolls should be capable of preventing the Shadow Reavers from being resurrected, and uses it on Black Garius when he confronts the PC in the courtyard, forcing him to flee. Later, at Merdelain, Garius tries to get Ammon to turn on the player with promises of being able to restore Shandra, but Ammon steadfastly refuses(regardless of influence) to join his enemy. In the end, if the PC decides to side with the King of Shadows, Ammon is killed and corrupted into servitude. If the PC decides to fight against the King of Shadows, Ammon stands by him/her and goes MIA along with the PC upon defeating the King of Shadows.
Mask of the BetrayerEdit
In the Mask of the Betrayer expansion campaign, it is revealed Ammon had pursued the gargoyles that abducted the PC into the Plane of Shadow. On the other side at the Veil Theater, he was confronted by Nefris, who knew of him from his studies at the academy. Seeing the threat he posed to their plans, she quickly subdued him. The Founder had him contained in the infirmary of the academy, and his soul was removed and was given to two pit fiend merchants employed by the Red Wizard academy.
When the player eventually arrives at the Academy in search of answers to the spirit eater curse, he/she finds Ammon at the infirmary in the instructor's lounge. The two pit fiends will offer to trade Ammon's marked soul in exchange for three souls (or two, if the PC or Gannayev haggles with them). If the player purchases his soul back, Ammon can be restored.
Ammon will reveal everything that happened at Merdelain after the King of Shadows was destroyed, including the fates of all companions. Though he fulfilled his ultimate goal, he still has infernal pacts in effect and agrees to tag along with the player as a henchman. Though he parts ways after meeting the Founder, he agrees to bring some fiendish allies to help the player with the Third Crusade on the Fugue Plane, though the nature of the pacts only allow them to help out at the gate to the City of Judgement, as they cannot set foot into the city. His fate after the Third Crusade is not revealed, though it is stated that when he dies, he will be sent to the hells, as pacts with devils for your soul supersede the Wall of the Faithless or joining with your deity(even if he had one).
- A scene removed from the final release indicated that Ammon did not actually destroy West Harbor. He and his demons only passed through the village. Deleted content indicated that everybody was still alive after Ammon appeared at the village. After the cutscene, the PC was supposed to be able to return to West Harbor where the people state that they all had a strange dream that night where they smelled 'fire and brimstone', and that Tarmas for some reason did not have any dreams at all that night but he had another dream several nights before.
Devils and Demons in his ServiceEdit
Much of Ammon Jerro's great power, beyond that of normal warlock capabilities, was due to the fact he bound six powerful fiends, "some of the most dangerous in the Lower Planes" as he stated, in his Haven.
- Mephasm (Baatezu) - a pit fiend, polymorphed into the form of an exotic half-elf. The PC first encounters him at the Githyanki caves, where he is harassed by three succubi. Mephasm, initially identified only as a "Devil," claims he was set there by the githyanki, and asks to be freed with his "truename" Mephasm in order to shut off the force field. Upon departing, the field condenses into an "interdimensional sphere" that he gives to the PC, saying "we will meet again." This proves true as the party meets him again in the entryway of of Jerro's Haven. He admits that he was set there by the warlock in order to seal off the githyanki should Zaxis fail her task. He is far more cordial than the other five fiends, even to Ammon Jerro, and seems to show a special interest in Neeshka (suggesting he may be her grandfather). In Act III, he can optionally be summoned by the PC and Ammon in Crossroad Keep to make "bargains."
- Baalbisan (Tanar'ri) - a balor demon that has a strong disdain for females, possibly due to his issues he has with his own mother. He also has a certain dislike for the Baatezu, evident when he first meets Neeshka. It is revealed by Blooden that his mother is actually a lesser fiend.
- Hezebel (Baatezu) - an erinyes that is currently feuding with Baalbisan. She is trying to upset the balance of power within the haven so she can have an advantage over Baalbisan.
- Zaxis (Tanar'ri) - a Hezrou demon and, in a bizarre twist, Baalbisan's matron. The party first encounters Zaxis at the Githyanki caves, where she was unsuccessfully trying to breach the door to Zeeaire's portal. The PC can fight her or trick her in order to banish her. At the Haven, it is revealed by Blooden that Zaxis is not only female but is Baalbisan's mother, much to Neeshka's astonishment, and was once a marilith that got demoted due to her incompetence. Her true name is Bethshiva, which indicates that she is a lower level demon (higher level fiends have much longer true names).
- Koraboros (Baatezu) - a pit fiend, also known as the "one who sees plots within plots". He has an imp in his service whom he treats like a gopher boy. After being freed, he later appears to Ammon at Shandra's farm taunting and mocking Ammon for killing his very own granddaughter, and attacks the party.
- Blooden (Tanar'ri) - a Succubus and mistress of the Deep Crest, the breeding grounds of the Abyss. She seems to have an infatuation with Koraboros, despite the fact he's devil and she's a demon. She comments rather casually that she has mated with many mortal men, even those of Celestial descent, but none have survived her violent mating habits. If the PC is male, she will make suggestive comments, hoping the player won't "leave a mess" like all the others.
- Ammon is voiced by Murphy Guyer.
- It is mentioned even at the end of the game that he is still bound by contract to the Lower Realms.
- Although Ammon Jerro clearly is a powerful wizard, additionally to being a warlock, he only leveled as a Warlock in NWN2 meaning that he is far more powerful than displayed in the game