Before Kingdom Hearts χ
Ephemer becomes a Keyblade wielder at an unknown point. Shortly afterwards, Ephemer meets Skuld and joins her party. Over time, more wielders gradually join them as their journey to gather Lux. Due to their busy schedules, however, Ephemer and Skuld begin drifting apart, putting a strain on their friendship. Eventually, Ephemer decides to leave the group to go his own way.
Ephemer begins to question the secrets of the world and the Book of Prophecies. Seeking answers, Ephemer approaches Foreteller Ava and asks her why the Unions compete against each other rather than working together, and Ava explains that it is because the Master of Masters arranged for things to be this way between the Unions.
Kingdom Hearts χ[chi]
Ephemer meets Player one day while in Waterfront Park, where he is bested by an Invisible, and Player steps in to help Ephemer defeat it. Ephemer then introduces himself to Player, and the two find that they are from opposing Unions. In spite of this, Ephemer reveals that he is investigating the truth behind the Book of Prophecies and why the Unions compete against each other for Lux.
When Player tells Ephemer about a dream of they had the night before, where the Foretellers met with a hooded figure in the Foretellers' Chamber, Ephemer suggests that they investigate the Foretellers' Chamber located in the Clock Tower. Ephemer and Player attempt to sneak into the Clock Tower through an entrance in the sewers, but are mobbed by Heartless along the way and unable to proceed further. With too much time wasted battling the Heartless, Ephemer persuades Player that they should continue their investigation the following day since it would suspicious if their Union leaders notice that they were missing for too long.
Sometime later, Ephemer comes across a depressed Ava sitting alone in the Fountain Square. Ava confides in Ephemer about her doubts about the Master's teachings regarding the competition between the Unions, much to his surprise. Ava approves of Ephemer's desire to solve the mysteries of the world, as she believes that people should question things and think for themselves. Ephemer jokingly tries to get Ava to talk about the Book of Prophecies, but she denies him. Ephemer tells her that he had befriended a Keyblade wielder from a different Union, and Ava is pleased that wielders from other Unions could work together. Before Ephemer leaves, he asks Ava to cheer up, which brings a smile to her face.
Later that night, Ephemer returns to the sewers alone to continue his investigation without Player. Before Ephemer can enter the Clock Tower, however, he is confronted by Ava. Relocating to the outskirts of Daybreak Town, Ava divulges the final entry in the Book of Prophecies, which details the events of the Keyblade War, and invites Ephemer to join her Dandelions to ensure the future of the light. Although skeptical, Ephemer agrees, and Ava proceeds to explain that she intends on choosing five people from the Dandelions, including Ephemer, to act as Union leaders in the Foretellers' stead after the Keyblade War. When Ephemer expresses his reluctance about being a Union leader, Ava implores Ephemer to rise up to the challenge and provides a book of rules that must be followed once the new Union leaders take charge to prevent future destruction. Additionally, Ava informs Ephemer that the Union leaders must erase the memories of the Keyblade War from their fellow Dandelions and avoid any possible connections between the two worlds, thus the truth about the Keyblade War must be kept a secret among the new Union leaders. In spite of his doubts, Ephemer accepts this task. Ava then sends Ephemer to travel to another realm in preparation for what is to come, instructing him to meet the other Union leaders in the Keyblade Graveyard following the war.
From this other realm, Ephemer attempts to reach out to Player by showing them his conversation with Ava in a dream. In the dream, Ephemer meets Player in the Fountain Square as they were originally meant to and apologizes for being late before they go to the sewers. However, when Player becomes uneasy, Ephemer tells Player that he will be waiting for them and disperses into a cloud of dandelions. Around the same time, Ephemer also visits Skuld in a dream and tasks her to seek out Player, informing her that the end of the world is near.
When the Dandelions cross over to the new world, Ephemer is reunited with Skuld, who had accepted Ava's invitation to join the Dandelions. They venture back to the Keyblade Graveyard following the conclusion of the Keyblade War and find Player unconscious on the battlefield. When Player awakens, Ephemer happily reunites with Player and convinces them to join the Dandelions. Ephemer and Skuld bring Player to the new world, where Player's memories, along with the memories of the other Dandelions, are erased upon arrival.
Kingdom Hearts Union χ[Cross]
As per Ava's instructions, Ephemer goes to the Keyblade Graveyard and is shocked to learn that Skuld is one of the new Union leaders, as the identity of the Union leaders was meant to be kept secret until they all met after the war. They are soon joined by the third Union leader, Ventus. While waiting for the other Union leaders to appear, Ephemer and Skuld strike a quick friendship with Ventus, who voices his jealousy over Ephemer and Skuld's close friendship since he has always been a loner, though Ephemer assures Ventus they are now friends as well.
When the fourth Union leader, Brain, arrives, he asks if Ephemer is their leader, and Ephemer denies this, as the decision must be made once all of the Union leaders are present. When the others begin expressing their discomfort with lying to everyone about the Keyblade War, Ephemer thinks about the pain that Player endured because of the war and states that it must remain a secret since he does not want people to remember the tragedy.
Later on in Daybreak Town, Chirithy reports to Ephemer and Skuld about Player's persisting nightmares about the Keyblade War. While Skuld encourages that Chirithy to protect Player from the truth, Ephemer mentions that he senses a different darkness that he plans to look into with Skuld. Once Chirithy has gone, Skuld questions Ephemer's wisdom about telling Chirithy about the darkness, as they likely just made Chirithy worry, but Ephemer argues that it affects Chirithy as well, and that the more that the new world differs from its predecessor, the more uneasiness will be generated. Furthermore, Ephemer points out that the Union Cross results in him sensing a different kind of malice and darkness. Skuld then reminds Ephemer that the rules dictate that they start the Union Cross, which Ephemer accepts and suggests that they will let their hearts be their guiding keys.
Ephemer has curly, silver hair and blue eyes. He wears a white shirt under a black vest, dark grey pants, and black boots. He has a red scarf around his neck.
"Ephemera" refers to things that are short-lived or transitory.
Ephemer wields the third upgrade of the Starlight Keyblade.
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