The portal deposits Samkiel and Dianna in a ruined city at the Netherworld’s center, once a grand ceremonial hub before Nismera’s conquest. As they enter a half-collapsed building, Samkiel directs Dianna’s gaze to a massive 12-eyed insect creature beside a web-wrapped mummified body. He kills it with a thrown dagger. When Dianna turns to confront him about their unresolved issues, she finds him kneeling, holding a shimmering silver ring and asking if he is performing the Onunan marriage proposal correctly.

Dianna hesitates, explaining that a life with her may cause him pain and she refuses to hurt him the way she has hurt others. He tells her he loves her, but she insists she is too broken and violent. He calls her a coward for running from fear, revealing he left after their argument to have the ring made. He follows her outside, reminds her of her promise never to abandon him, and holds out the ring, saying it signifies commitment no matter what. Suddenly, the ground splits open and swallows Samkiel whole.

Dianna shifts into her four-legged beast form and dives into the chasm. She recognizes that her bond with Samkiel is not an emotion but a physical necessity. Dianna tears through the tunnels, slaughtering insects in a rage. She lands in the hive’s central cavern, surrounded by hundreds of cocooned corpses. A scratchy disembodied voice calls her Ro’Vikiin reborn and demands to know why she protects a Lightbringer—its term for Samkiel—claiming his kind tore the cosmos apart from their darkness. Using their bond, Dianna locates Samkiel’s presence far below, breathes a torrent of fire to burn the queen and her webs, and escapes down the revealed tunnel. The enormous queen cannot follow.

Dianna shifts back to her bipedal form and finds Samkiel in a large cavern, outnumbered and weakening. She seizes his sword, joins the fight, and declares her love mid-battle. They fight back-to-back, and Samkiel uses a summoned light bow to collapse the main entrance, cutting off the swarm. Afterward, Dianna demands he propose again. She confesses her fears—that she always assumes the worst and run away from love—but she admits that being without him is worse than anything.

Samkiel affectionately calls her an idiot for her selflessness, then says he couldn’t be anything but in love with her. They attempt to kiss but are immediately put off by the gore covering them both. Samkiel proposes again and Dianna says yes. As the enraged queen sends a new horde after them, Samkiel places the ring on Dianna’s finger and a suit of silver armor forms over her body.

Samkiel pulls Dianna from the hole. Her new silver armor mirrors his but fits her form, protecting her from weapons set ablaze. He teaches her to retract her sword into her ring and reveals their true purpose in the city: to retrieve Everrine, the last officiant capable of performing the Ritual of Dhihsin, joining them forever. Though Dianna has no soul, Samkiel insists the ritual will still make her his wife in every meaningful way. He explains he planned everything during his absence—the rare gemstone, the ceremony location, and her wedding dress—fulfilling his tradition’s three proposal obligations. When they find Everrine’s barricaded room, she attacks Dianna with a rusty spoon before Samkiel calms her with a command. Everrine then weeps and kisses Samkiel’s cheeks in gratitude. Dianna pries her off, growls possessively, and Everrine flees screaming up the stairs.

The three arrive via portal on a breathtaking planet of mountain ranges and floating islands that Samkiel intends to be the new Rashearim. Everrine immediately pledges her life to Dianna and begs not to be eaten. Samkiel reveals a massive castle carved into a nearby mountain, which he scouted during his absence. Inside, he has already placed framed photographs retrieved from Old Rashearim—including images of her sister Gabby and their friends Neverra and Imogen. He asks Dianna to make the castle their home. He reveals the white lace wedding dress he chose for her. To prove he truly knows her, he recites her favorite color, a childhood scar, her love of the ocean, and other intimate details without hesitation.

As Dianna does Miska’s hair for the wedding, she tells her she wishes her sister and missing friends were present. When Reggie arrives, Dianna asks him to walk her down the aisle, citing him as the closest thing she has to a father. He accepts with obvious joy.

In a lower chamber of Nismera’s palace, Vincent stands at attention while Nismera paces, angry over the death of her commander Tedar. Two witches, Tessa and Tara, contain the screaming of two chained fates, beings similar to Roccurem, and seal the chamber door with magic. Nismera orders Vincent to burn every city with rebel activity in the East, leaving no survivors. When she kisses him, he thinks only of Camilla. Nismera’s announcement that she will join him personally on the battlefield alarms him—her presence in the field means eradication, not capture.

Before departing with his legion, Vincent pauses at Camilla’s door but forces himself to leave. As he leads his forces through the East, burning and killing, the fates’ repeated cries echo in his mind, warning him to fear the Queen of Rashearim.

Reggie escorts Dianna downstairs to a lower level of the castle that Samkiel has magically adorned with flowers, vines, and gleaming stone. Samkiel waits on a raised dais in a white and gold royal uniform. Everrine performs the Ritual of Dhihsin, drawing glowing runes and then producing a blade to draw blood. Dianna instinctively shields Samkiel before he reassures her it is part of the ceremony. Everrine cuts both palms and binds their joined hands with a ribbon. They repeat vows pledging to be one in heart, body, and mind. At the reception, Dianna dances with Samkiel, Reggie, their companion Orym, and Miska. Samkiel tells Dianna he loves her, and she replies that she does not need a soul to feel that love in return. She admits to Samkiel that, back in the prison, she witnessed their friend Logan blink—just once—when Samkiel turned to leave, giving them both hope that the mind-controlled members of the Hand can be restored.

As Orym and Miska depart through a portal, Reggie speaks cryptically and becomes confused, unsettling Dianna. Alone, she and Samkiel discover their wedding rings create a powerful resonance when pressed together. Samkiel explains that his friends Killium and Jaski—both in hiding from Nismera—crafted the rings with arcane magic to partially mimic their lost amata mark, allowing them to sense each other’s emotions and thoughts.

In the magically decorated bedroom, Dianna acts out a fantasy involving Samkiel in his council attire. He eventually restrains her with his power and they have sex. Through their rings, Dianna hears his unspoken declaration of love—their thoughts and feelings fully shared between them.

After an extended wedding night that stretches into the next evening, Dianna watches a Samkiel prepare food in the kitchen—a rough approximation of a vegetable dish she once made on Rashearim. She forgives him for leaving. When she raises the subject of surnames, he proposes that he take her name, Martinez. She argues Gabby invented it and it isn’t real, but he insists it carries a genuine legacy. As they are about to kiss, a brilliant streak crosses the night sky. Samkiel identifies it as a casmirah, a mythological creature that appears only to herald a new ruler—and he looks pointedly at Dianna’s ring.

One day after the casmirah sighting, Reggie watches a man on a street corner finally meet his destined wife. Miska gifts Reggie a music player before Orym asks her to leave. Orym reports the entire East has been annihilated and that Nismera believes the casmirah appeared for her and that she has eliminated the threat of Dianna. Reggie explains that Nismera acts from fear of losing power, noting that the thing that should truly frighten them has not yet arrived.

On the day of Nismera’s coronation, Kaden enters Camilla’s room and taunts her about Vincent. He reveals a casmirah appeared the previous night, which Nismera interprets as heralding her own ascension. Their former ally Cameron, newly promoted to legion commander, is being sent to investigate the demolished hive-city. At the coronation party, winged soldiers file in, followed by Queen Milani of Trugarum—a deadly, powerful ally who rules the southern realm. Isaiah arrives with Imogen. When Camilla objects, Kaden explains that Isaiah keeps her close to shield her from the assault at the generals’ hands.

They observe a captive muse—possibly the last in existence—singing on stage in silver chains, gifted to Nismera by a neighboring queen seeking protection. Nismera descends a grand staircase wearing the crown of her father, Unir, claiming the title of King of the Gods, and every person in the room kneels. During the dancing, Kaden tells Camilla that Vincent watches her when she isn’t looking. Overwhelmed, Camilla flees. In the corridor, she is pricked by a pin from a mysterious crowned man who calls her a witch queen before vanishing as Vincent storms up the stairs after her.

Vincent drags Camilla into a private room. They argue—she accuses him of staying loyal to Nismera despite her indifference to his near-death, and he accuses her of involvement with Kaden. Camilla gives him an ultimatum: fight for their relationship or she will attempt to escape the palace. He kisses her and admits he has not been with Nismera for months. He explains Dianna’s destruction of Tedar’s legion prompted Nismera to annihilate the East, and he has since been commanding missions to collect components for a weapon. They commit to each other, agreeing that they will leave together or not at all.

During their sexual encounter, Camilla channels her magic through Vincent. As they catch their breath, Cameron opens the door, having heard everything through the walls.

Cameron mocks Vincent and demands something in exchange for his silence, threatening to expose Camilla to Nismera. He punches Vincent in the jaw. Vincent admits responsibility for the fate of Cameron’s love, Xavier, then provides information as recompense: the location of a war camp called Paule, where Nismera plans to lure Dianna, which gives Cameron a chance to act first. He also warns that Nismera has been moving Xavier’s from place to place repeatedly, using him to control Cameron. Cameron calls Vincent heartless, but confirms he won’t betray Camilla.

Months after the wedding, Dianna, Samkiel, and Orym convene in the study to address the destruction of the east realm. Dianna is frustrated at their lack of progress. Samkiel explains a direct attack on Nismera is too dangerous—he is not at full power, and Nismera is a gifted warrior known as the Shadow for her speed and ruthlessness. When Dianna proposes destroying her from the inside out, Samkiel agrees.

Dianna settles Reggie into his new room and confronts him about the painkilling teas Miska has been preparing for him. He admits to lingering pain from Nismera’s earlier torture. Dianna finds Samkiel in his study with Orym and an unfamiliar female elf standing close to him. She attacks the elf, pinning her to the desk, before Samkiel pulls her off and introduces her as Veruka, Orym’s sister and an informant. Dianna is shocked to detect Isaiah’s scent on Veruka but also, faintly, that of their friends Cameron and Imogen—confirming they are alive. Veruka confirms Imogen is under Isaiah’s control and Cameron now commands his own unit.

Preparing to infiltrate the Paule war camp, Veruka provides scent-masking bracelets from a witch contact. When Dianna asks if the witch is Camilla, Veruka says no but confirms Camilla is alive, closely watched by Nismera, and entangled with Vincent. Samkiel and Dianna are stunned to learn Vincent survived. Dianna insists they rescue Camilla. Veruka pledges loyalty to House Martinez.

Samkiel rides Dianna in her ryphor form—a massive, flying, worm-like beast—toward the Paule war camp, with Veruka flying alongside. Dianna grumbles telepathically about the indignity of being a worm. Dianna is left hidden in a tent while Samkiel and Veruka infiltrate the camp as soldiers. Veruka presses Samkiel, suggesting Dianna fights only to save him and may not truly want to rule. She chides him for never asking her. Samkiel relays the exchange through their ring connection, and Dianna firmly reassures him that she chose him, knowing full well what came with the arrangement, and she wants all of it. As they approach the camp, they identify Commander Illian’s tent.

Inside Illian’s tent, Samkiel finds a map charting every world Nismera plans to strike and pockets payment documents listing potential benefactors. Before they can leave, a portal opens and Neverra steps through, stabbing his hand to the table with a serrated blade. Soldiers flood in from multiple portals led by Illian, who has also captured Orym. He takes Veruka prisoner. As Illian reaches for Samkiel’s helmet to identify him, Samkiel mentally calls for Dianna’s Plan B. Her roar erupts outside, and the distracted Illian rushes out. Samkiel shoves Neverra aside and uses a small portal to stun her and send her to the forest edge. He steps out to face the burning camp.

Samkiel fights through the chaos while Dianna burns the camp from above. A recovered Neverra tackles him and attacks relentlessly under a kill command. Samkiel refuses to fight back, blocking her strikes and calling Logan’s name. Dianna intervenes briefly before Samkiel persuades her to rescue Orym and Veruka. He opens a portal revealing Logan in his cell. Seeing Logan causes Neverra to briefly break her conditioning—she calls Samkiel’s name before screaming as the mind-control crushes back down. The moment of lucidity is enough to give Samkiel hope: If she can be reached, all his family can be saved. He renders her unconscious with a pressure point and carries her through a portal.

Dianna destroys most of the camp’s ryphors in her true Ig’Morruthen form—the four-legged beast she had become in the hive. On the ground, Illian grabs her and uses his paralyzing touch to drain the function from her limbs. Samkiel arrives and kills Illian. Samkiel heals Veruka’s wounds, but three ryphors who witnessed Samkiel’s silver power escape. Against Samkiel’s orders, Dianna takes to the sky after them, but the pursuit is a trap: two more ryphors appear flanking her, a net of silver light stretched between them—lethal to an Ig’Morruthen in its true form. Flying too fast to stop, Dianna braces for the net, but Cameron—in his own gray and black Ig’Morruthen form—slams into her from below and absorbs the impact. Both their wings are shredded, and they fall. Dianna wraps her damaged wings around Cameron as they crash to earth.