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Eight years has passed since Tagon took the throne as the second coming of Aramun. Eunseom succeeded in uniting the Ago clans as the second coming of Inaishingi and he leads them to the great war against Arthdal. Meanwhile, Saya must prove his worth to succeed Tagon.

The first battle between Arthdal, led by Saya, and the united Ago forces, led by Eunseom, takes place in Hanchoa. Eunseom and the Ago forces gets overwhelmed by Arthdal's military power. Meanwhile, Tagon realizes the elevated status of Tanya as the second coming of Asa Sin and begins to feel threatened by her absolute power.

The united Ago forces faces an unforeseen situation, causing anxiety among its leadership that the alliance, which has been unified for 200 years, may fall apart. Meanwhile, Tanya is confronted with a truly incredible situation.

Prince Arok, the son of Tagon and Taealha, is abducted, and the Arthdal Palace is in an uproar. Meanwhile, someone approaches Tanya and leads her to a place that has been kept secret for a long time.

The last prophecy by Aramun is announced. Eunseom, Tanya, and Saya try to figure out what it means!

Saya tries to take over the Ago Union. Tanya sets a great plan in motion, and Taealha gets closer to the truth. With Tagon's orders, Arthdal faces a new crisis.

Eunseom finds an unexpected breakthrough in despair. Saya's plan envelops Arthdal in fear.

They need to stop Tagon. A brutal night falls on Arthdal. Eunseom advances close to Arthdal.

The day of Tagon and Eunseom's battle comes. Tagon faces a shocking truth.

Eunseom's Ago Union and Tagon's Arthdal have the final battle in the Arth Forest.

Tanya who wants to change Arthdal's owner and Taealha who wants to protect Arthdal fight.

The final battle between the Ago Union and Arthdal has come. Tagon prepares for a personal war. Tanya, Taealha, Saya, and Eunseom make one final move to protect what's most precious to them. Who will take over Arthdal?