Ep 11. Episode 11

At the start of episode 11, Tagon prepares to lead his army on the attack against the Wahan tribe, who have allied themselves with the Union. The Arthdal soldiers are confident in victory, but Taealha is worried, as she knows that the Wahan have expert archers that could decimate their army.

Meanwhile, Eunseom and Saya continue on their journey to find the legendary sword that can kill the Neanthals. They come across a group of warriors who challenge them to a fight, but Eunseom manages to best them in combat. However, they are interrupted by a group of Neanthals who attack them.

Back in Arthdal, Taealha is visited by her father, who reveals to her that he has been working with the Union all along. He tells her that the Union has always planned to use her as a pawn to gain control over Arthdal and its resources. Taealha is devastated by this revelation and begins to plot her own revenge against the Union.

As the battle between the Arthdal army and the Wahan tribe begins, Tagon and Taealha lead the charge. However, the Wahan prove to be a formidable opponent, and Taealha's fears about their archers prove to be justified. Many Arthdal soldiers are killed, and Tagon is injured in the battle.

Meanwhile, Eunseom and Saya manage to escape the Neanthals and continue on their journey. They come across a group of traders who offer to sell them food and supplies. However, the traders recognize Saya as the twin of the Arthdal prince, and Eunseom and Saya are forced to flee when the traders try to capture them.

Back in Arthdal, Taealha meets with the leader of the Union and proposes an alliance between their two factions. She suggests that the Union can use Arthdal's resources, and in exchange, Taealha will be given control over the Union's army. The Union leader agrees to the proposal, but Taealha secretly plans to use the Union's army to overthrow Tagon and become the leader of Arthdal herself.

As the episode comes to a close, Tagon returns from battle, injured but victorious. He is treated by the Arthdal doctors, but he knows that his days as leader are numbered. Taealha continues to plot her revenge against the Union, and Eunseom and Saya must continue on their dangerous journey to find the legendary sword.