The War of the Vices

Lore & Background

In the world of Fourth Wing, the bond between a human and a dragon is not merely a tactical advantage; it is the ecological and political backbone of civilization. The Vices represent the antithesis of that bond—humans who have been twisted into something that undermines the very relationship that keeps the continent stable. Their corruption is not a foreign invasion but an infection from within, which is what makes the War of the Vices so psychologically devastating for the Riders. The people they fight look like the people they train beside, love, and grieve.

The war is never a simple line of Riders versus Vices. It is entangled with the Crown's political maneuvering, the loyalties of the great Houses, and the slow, agonizing decline of the dragon population. Every front of the war—military, political, personal—feeds the others. A betrayal in a council chamber can cost a squadron on the battlefield. A dragon's death in a skirmish shifts the balance of power in the throne room. The Vices exploit these interconnections, and the Riders must defend against a threat that is simultaneously a war, a conspiracy, and a plague.

What makes the arc resonate with readers is that the war's resolution is not purely military. Victory requires the Riders to confront what their own institution, their own loyalties, and their own willingness to sacrifice have made of them. The Vices are not only the enemy; they are a mirror, forcing the Riders to ask whether the war is making them into something as broken as the people they fight.

In Their Own Story

The wind over the training grounds smells of scorched pine and iron. Violet feels the vibration in her teeth before she sees the smoke—three columns, rising from the eastern ridge where the Vices are supposed to have been driven back weeks ago. She does not call out. She does not need to. Xaden's wing shifts beneath him, a low, grinding sound like stone on stone, and he is already turning the dragon's head toward the smoke. Around them, the other Riders are unclipping their harnesses, moving with the terrible, practiced calm of people who have learned that the war does not announce itself with a horn. It announces itself with silence, and then with fire, and then with the sound of someone you trusted screaming a name that is not their own. Violet presses her forehead to the warm scales of Sgaeyl and whispers, not a command, not a prayer—just a name. Her own. Because in this war, the first thing the Vices take is your certainty that you are still yourself. And the second thing they take is everyone else's.

Reader's Guide

The war ignites in the first book as a series of escalating attacks that shatter the Riders' assumption that their training is preparation for a distant, abstract enemy. The Vices are not a foreign army; they are corrupted humans operating from within the continent's own political and social structures. The central conflict is the Riders' fight to survive long enough to understand what they are actually fighting, while the Crown and the Houses maneuver around them. The emotional throughline is Violet's struggle to trust—her bond, her allies, her own instincts—while the war systematically strips away every layer of safety Basgiath was built to provide. By the end, the Riders have survived, but the continent's political order is cracked, the dragon population is visibly declining, and the Vices have proven they can infiltrate the highest levels of command.

In the second book, the war widens. The Vices are no longer a threat to be repelled; they are a presence to be endured. Xaden and Violet are pulled into the political heart of the conflict, where the war is fought with alliances, secrets, and the slow erosion of trust between the Riders and the Crown. The central conflict shifts from survival to accountability: who is responsible for the Vices, and what will the Riders do when the answer implicates their own institution? The emotional throughline is the cost of loyalty—Xaden's duty to his people warred against his bond, Violet's refusal to let the war consume the person she is. The world at the end is more divided, more exhausted, and the Vices are closer to their ultimate objective than anyone in the throne room wants to admit.

The third book brings the war to a breaking point. The Vices' endgame is revealed in full, and the Riders must choose between the world they were trained to defend and the world they have become. The central conflict is no longer military but existential: the Riders must dismantle the very structures that made them in order to save the continent. The emotional throughline is release—letting go of the war's grip on identity, grief, and duty. The world at the end is not the one that existed before the war began. It is new, scarred, and fragile, held together by bonds that were nearly broken. The Vices are defeated, but the cost is written into the land, the dragons, and the people who survived.

Did You Know?

• The Vices are not a foreign nation or a mythical beast—they are humans, which makes the war a fight against the Riders' own kind and complicates every act of violence.
• The war is not confined to the battlefield; political betrayal, House rivalries, and the Crown's decisions are treated as active fronts of the same conflict.
• The dragon population's decline is woven into the war's stakes: losing dragons is not just a military loss but an ecological and spiritual catastrophe for the continent.
• Violet's and Xaden's personal bonds are not a subplot separate from the war—they are the lens through which the war's moral cost is measured, and the war actively tests whether those bonds can survive it.