Deity (covenant, #3)

The third novel in Jennifer L. Armentrout's Covenant series continues the story of Alexandria "Alex" Andros, a seventeen-year-old half-blood—born of one pure-blood parent and one mortal—and the prophesied second Apollyon, a being of immense power. Alex trains at the Covenant, a school and military institution in North Carolina where half-bloods are raised as Sentinels, warriors who hunt daimons—supernatural monsters that feed on the life force of pure-bloods and half-bloods—or forced into servitude under the elixir, a chemical compound that renders them compliant. When two Apollyons exist simultaneously, the second's Awakening on her eighteenth birthday transfers her power to the first, Seth, transforming him into the "God Killer," capable of destroying gods.

The novel opens with Alex recovering from a series of crises. Her best friend Caleb was killed during a daimon attack she inadvertently caused, she killed a pure-blood Guard in self-defense, and her forbidden love, Aiden St. Delphi, a pure-blood Sentinel, used illegal compulsion on two pures to cover it up. If discovered, Alex faces execution and Aiden faces treason charges. Seth, the First Apollyon, deflects her questions about why she displayed impossible powers during a recent fight with furies, godly enforcers sent by the gods.

Alex receives a letter revealing her father, whom she believed dead, is alive and enslaved as a servant at the New York Covenant. Aiden helps her grasp the deeper implication: Her father is not mortal but a half-blood. Since her mother was a pure-blood, their union produced an Apollyon, confirming that relationships between the two bloodlines are banned precisely because they create beings of extraordinary power.

During training, Seth triggers a second Apollyon mark on Alex's palm. A cord of akasha, the fifth and most powerful element, pulls energy from Alex into Seth, leaving her drained while he grows stronger. Alex and Aiden also discover that the Order of Thanatos, a secretive organization of pure-bloods marked by a torch tattoo, killed the previous dual Apollyons using daggers dipped in Titan blood. Head Minister Telly, the leader of all Councils, and Instructor Romvi both bear the tattoo. Seth, who inherited memories of past Apollyons during his own Awakening, has clearly been lying about what he knows.

Seth departs for New York with Lucian, Alex's pure-blood stepfather and the local Minister. Before leaving, his touch triggers a third mark on Alex's stomach, deepening her suspicion that he is deliberately accelerating her Awakening. Once Seth is gone, the cord settles and Alex feels more like herself. She reconnects with friends, including Olivia, Caleb's girlfriend, who had blamed Alex for his death but now seeks reconciliation.

While Seth is away, Telly ambushes Alex, strikes her, and threatens to expose Aiden's compulsion unless she confesses to killing the Guard before dawn on Friday. Alex refuses. On the deadline night, Aiden guards her room. At dawn, Linard, a Guard secretly loyal to the Order of Thanatos, stabs Alex with a Titan-blood dagger. Aiden kills Linard, but Alex dies in his arms.

Alex's soul travels to the Underworld, where she reunites with Caleb. He warns her about Seth: "He thinks he's in control, but he's not" (160), and urges her to remember there is still hope. Apollo, the god who has been disguised as the Sentinel Leon at the Covenant to monitor Alex and Seth, argues with Hades, the god of the Underworld, for her soul and brings her back to life.

In his true form, Apollo reveals the Apollyon's history: Zeus created them as a check on pure-bloods, and an oracle prophesied that one of the current pair would save the gods while the other would destroy them. The Apollyon's markings function as wards against the gods; only the Order's Titan-blood daggers or another Apollyon can kill an Apollyon. Apollo, Aiden, and Marcus, the Covenant's Dean and Alex's uncle, propose hiding Alex to prevent the power transfer, but she refuses, insisting Seth deserves a chance.

Alex is relocated to the St. Delphi family home during winter break, where her relationship with Aiden deepens. He reveals he tracked down and killed the daimon who tortured her, and Alex discovers the necklace he always wears holds a guitar pick she once gave him. On Valentine's Day, they consummate their relationship. Aiden confesses he has loved her since the night they met, and they plan a future outside the Hematoi world, the society of pures and half-bloods whose laws forbid their relationship.

When Seth returns, he brings Telly, beaten and imprisoned under compulsion on Lucian's orders. Lucian then traps Alex in his house, sealed with a blood symbol that bars Apollo from entering, and reveals his ambition: to overthrow the gods, enslave mortals, and rule with the Apollyons as his enforcers, backed by a powerful divine supporter. Alex attempts to stab Lucian but Seth stops her. Seth forces the fourth Apollyon mark onto Alex's neck, tearing akasha from her and briefly channeling God Killer-level power. He holds her captive for days, draining her repeatedly.

Lucian calls an emergency Council session, exposing Telly's crimes and publicly revealing Aiden's compulsion to make Aiden a target. Despite Alex's pleas, Seth obliterates Telly with akasha drawn through their bond. When Council members refuse to support Lucian's coup, Seth kills four of them, including Dawn Samos, the sister of Alex's classmate Lea. He also destroys a furie that crashes through the dome, an act previously thought impossible. Apollo appears and holds Seth off while Aiden, Marcus, the half-blood Sentinel Solos Manolis, Aiden's brother Deacon, Alex's friend Luke, and Lea escape with Alex.

As they cross the bridge from Deity Island, where the Covenant is located, Poseidon, the god of the sea, destroys it with massive water cyclones, killing hundreds. The group flees to a safe house in Athens, Ohio, protected by a rune barring hostile gods. During a gas stop, Hades attacks with hellhounds, insisting Alex must die to prevent the God Killer from rising. Shaken by the destruction, Alex nearly accepts his offer, but Artemis, Apollo's twin, intervenes and shoots Hades with an arrow. Before vanishing, Artemis offers a hint: "Power never flows just one way. The key is finding a way to reverse it" (305).

At the safe house, Apollo states the only solution is for Alex, once Awakened, to kill Seth. Lea, devastated by her sister's murder, demands Alex act. Alex refuses, insisting Seth is still reachable.

On Alex's eighteenth birthday, the Awakening begins. Glyphs burn into her skin as thousands of years of Apollyon memories flood her mind. Among the visions, she glimpses Solaris, a past Apollyon, turning her power on the First not to kill him but to subdue him, with love in her eyes. Despite the vast distance between them, the cord snaps alive and connects with Seth. His consciousness floods hers, drowning out her thoughts and identity. Alex's eyes change. Apollo bursts in and warns she has connected with Seth. But Alex, now smiling with Seth's intent behind her eyes, sees everyone in the room as targets. The novel ends with Seth having gained control of Alex through their bond, and all those she loves in immediate danger.