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The warlord Apollyon takes control of the knights of the Blackstone Legion after murdering her rivals, who fight for the people of the land of Ashfeld, allowing her to sow the seeds of perpetual war and create stronger men to rule over the weak. During the Blackstone Legion's attempt to bring a dishonorable lord-turned-mercenary, Hervis Daubeny, to justice, his second-in-command, known as the Warden, helps to stop the Blackstone siege and battles the champion of the Blackstone knights. Upon defeating a Blackstone Legion captain, Ademar, the Warden is made a knight of the Legion by Holden Cross, Apollyon's lieutenant, and leaves with him. During his/her time in Apollyon's army, the Warden helps to defend against the Viking raiders of the Warborn, but soon realizes shortly after meeting with Apollyon that she cares nothing about protecting people and seeks to manipulate her enemies into endless battles. Starting with the Vikings, Apollyon and her warriors including Cross, the Warden and fellow lieutenants Stone and Mercy, attack their settlements and sack their strongholds in the northern land of Valkenheim, leaving only enough food and supplies to fight over, and sparing those who would eagerly fight for those scraps or are strong enough to do so.

Afterwards, in Valkenheim, the Viking clans fight among themselves, killing one another for the dwindling scraps left by Apollyon. This continues until a powerful warrior known as Raider comes down from the mountains, and begins uniting the warriors of the various clans under the Warborn banner, alongside Warlord friend Stigandr, Valkyrie warrior Runa and Berserker Helvar, first by killing the brutal raider Ragnar, who steals what little remains from those who cannot feed themselves, and then Siv the Ruthless, who seeks to conquer and plunder their own people. After killing their rivals, Raider's rapidly growing army retake a Warborn stronghold from knights of Apollyon's army, and then set out to the land of the Myre to raid the Dawn Empire of the Chosen, a group of powerful Samurai, to resupply and feed their people. The Raider then leads the assault on the Samurai, kills the Samurai General, Tozen, and causes the Samurai to retreat back to their greatest city. In the chaos, Apollyon kills the Dawn Empire's ruler and his daimyōs that refuse to fight.

Into this chaos is brought the Orochi warrior known as the Emperor's champion, the strongest and most fearsome warrior in the Dawn Empire. The champion was imprisoned for speaking out of turn and was freed during the chaos of the Viking raid. The Orochi helps to push back the Vikings, but fails to prevent Apollyon from riding through the chaos and murdering the Imperial family, forcing the Daimyos to fight one another for control of the Dawn Empire. After learning of the devastation the Viking raid caused, she/he, fellow samurai Ayu, the Shugoki Okuma and Nobushi Momiji attempt to reunite the Daimyos under one banner, using Apollyon as a common enemy to rally against. The Emperor's Champion infiltrates the Emperor's palace with Momiji and confronts Seijuro, the Daimyo who took Apollyon's offer to become Emperor. After defeating Seijuro, the champion convinces him to join him against Apollyon. It is also during this time that the Emperor's Champion learns of Apollyon's manipulations of the various factions and rallies allies to stop Apollyon, invading Ashfeld to attack Blackstone Fortress. During a scouting mission with Momiji, the Orochi is met by the Warden, now leading a rebellion against Apollyon with Holden, Stone and Mercy by his/her side and, after dueling him/her, realizes they are allied against the same enemy. Both armies besiege the castle on separate fronts, with the Orochi searching for Apollyon. After finding Apollyon, the Orochi duels with and kills her, but not before learning that she wanted to create eternal war to weed out the weak and create the strongest of men, making them evermore bloodthirsty. Despite her death, Apollyon got what she wanted: an age of wolves.

In the aftermath, the armies of all three factions attacking the Blackstone Fortress; Knight, Samurai and Viking alike all turn on each other, resulting in a war lasting seven years. Realizing the war's futility The Warden, now leader of the Knights, sends Holden to meet with leaders of the other factions, Ayu and Stigandr. Though all three realize that the prospect of peace may be futile, they all agree that peace is worth fighting for and striving for it will make for an unforgettable tale.