The Elf King was the former ruler of the Elf Nation. He was an elderly stonekeeper completely controlled by Ikol.
History
Early Life
The Elf King was originally a quiet boy from a small elf village. Thirty years before the books take place, he was among a group of Stonekeepers that lost control over their stones and abilities causing their minds and bodies to become possessed by their stones. The possessed storekeepers transformed into colossal beasts that went on a rampage that ended only when members of the Guardian Council, including Emily's great-great-grandfather Silas Charnon, stepped in managed to subdue the beasts.
Doing so resulted in the corrupt stonekeepers' deaths. The sole exception was the future king, as the elders were able to separate him from his stone. Instead of executing him, they locked him up in solitary confinement in an attempt to cure him of his curse. While isolated, however, the boy spoke only of his desire for power, warned of dark days to come as well as telling them would regret keeping him alive, and he would show them why.
Leon Redbeard's father was a one of the guards assigned to watch over the boy's prison cell the night his stone rejoined him. The stone helped the boy escape by the means of a massive explosion, killing everyone present.
The Elf King then assumed leadership of the Elf Nation, through unexplained means. During his unnaturally long rule, the Elf King declared war on the rest of Alledia. However, none of this was through his will, as he was being controlled by Ikol the entire time as a puppet ruler.
Appearances In-Series
Book One: The Stonekeeper
The Elf King is not mentioned until the end of the book, during a battle between Emily and Trellis. Trellis attempts to convince Emily to help him in the assassination of the Elf King, however, this plan does not come to fruition.
Book Two: The Stonekeeper's Curse
The Elf King makes his first physical appearance when Trellis is captured and brought back to the palace after his failure to apprehend Emily. The King expresses his disappointment in Trellis's failure, and sends him out again with the assistance of Luger, the King's second-in-command. In secret, the Elf King enlists Luger to kill Trellis should the prince rebel against his father again.
Book Three: The Cloud Searchers
The Elf King appears again as Trellis delivers a report. The prince informs the king of Luger's death and that he will be continuing in his mission, despite the King's order that Trellis returns. The Elf King later sends a bounty hunter, Gabilan, to kill Emily and apprehend Trellis.
Book Four: The Last Council
The King is only briefly mentioned in The Last Council.
Book Five: Prince of the Elves
The Elf King travels to the Ice Prison of Korthan, where he and Max Griffin release a creature named Chronos from the ice. The King then orders Max and Chronos to start an assault on Frontera.
Book Six: Escape From Lucien
The Elf King speaks to Max about the voice of the amulet. Max, under the voice's guidance, decieves the King about the nature of the voice.
Book Seven: Firelight
The Elf King appears as part of a memory twice. The first time, he warns Trellis of his interest in ancient history and his idolisation of Virgil. The second time, the King interrupts one of Virgil's history lessons and detains him. Trellis tries to fight back, but the Elf King strikes him across the face and issues a Shadow, Sybrain, to Trellis.
Book Eight: Supernova
The Elf King sends Logi and a garrison of elf soldiers to surrender themselves to Frontera's army, giving Logi an explosive device. Once the troops are inside the prison, it detonates.
Emily later travels to the Elf King's palace and reveals to the elves that he was controlled by the Voice all along. Ikol, through the Elf King, begs Emily to lead the elves with him, but Emily refuses and institutes Trellis as the new king.
Physical Appearance
The Elf King is a tall and imposing figure, draped in a white cloak and a long neckplate with his stone set within the collarbone. His hands are clawed and can be used as a weapon.
The Elf King wears a mask that completely hides his face, apart from his long elf ears. Underneath his mask, his face has been mutated and branded with the symbol of Ikol. His facial features are completely gone, aside from his mouth.