The narrative begins within the court of King Arthur, following a devastating military campaign against five enemy kings. The loss of eight great knights necessitates a selection process for the Round Table. Arthur’s decision to favor Sertor over his own nephew, Sir Bodemagus, serves as the primary catalyst for the conflict. Morgana Le Fay, fueled by feelings of slighted familial pride, vows to seek "revenge from afar." This moment highlights Arthur’s commitment to "chivalry" and "greater deeds" over blood ties, a decision that ultimately isolates him from those harboring deep-seated resentment.
Morgana Le Fay is presented as a formidable antagonist, possessing "magical powers" originally imparted by Merlin himself. Recognizing that her vengeance against Arthur is impossible while the wizard remains his advisor, she orchestrates a calculated plot. She identifies a young woman named Vivian, characterized as "without any heart" and "cold and cruel," who covets the very "wisdom" Merlin possesses. Morgana exploits Merlin’s singular, fatal flaw: his "love of beauty" and his inability to foresee his own future, despite his capacity to see into "anyone else's future."
To ensnare the wizard, Morgana provides Vivian with a "secret weapon": two rings designed to "unite their wearer's heart forever." Vivian’s entrance into the court is a masterclass in psychological manipulation. She presents the ring as a test of worthiness, baiting the ego of every knight present. When Merlin finally accepts the challenge, the ring acts as a binding agent, physically and metaphorically fusing to his finger. The magic of the ring immediately suppresses Merlin’s intuition, leaving him infatuated with Vivian’s "youth and beauty."
Over a protracted period, the "lovesick old wizard" systematically surrenders his life’s work to Vivian. He teaches her the profound secrets of his craft, including the ability to "build castles out of nothing more than earth wind, fire and sky." Vivian’s patience is calculated; she waits until she has extracted every ounce of knowledge before initiating the final stage of her plan.
The end of Merlin is marked by a mixture of malice and cold efficiency. Vivian uses a "powerful sleeping potion" to incapacitate him. Even in his weakened state, Merlin’s concern for the kingdom remains, as he pleads with Vivian to "save King Arthur from some coming danger." This moment underscores the tragedy of his character: a man of immense intellect whose altruism and vulnerability to human connection rendered him defenseless.
Once Merlin is rendered "helpless," Vivian weaves a "silver web" around him, trapping him in a state of paralysis. The final indignity—placing him in a "large heavy box" and burying it beneath a "magical mist"—serves as the definitive conclusion to his legacy. The story concludes with a sobering reflection on the "shameful end of a very wise but very weak old man." It serves as a cautionary tale regarding the dangers of unchecked vanity and the vulnerability of even the most enlightened minds when faced with the enticements of human desire.