Wander's story begins with his entry into the Forbidden Land, crossing the wide bridge at the entrance to his horse, Agro. According to Lord Emon later in the game, before they enter the forbidden land Wander stole a magical sword, probably from Emon himself, who is the only weapon capable of killing the colossus in the Forbidden Land.
Following the great Temple of Worship in the center of the region, Wander carries with him a body covered by a mantle which he lays upon an altar in the temple. Removing the cloak, it is revealed the body of a maiden named "Mono". After a moment, various dark creatures with the appearance of shadows and form of humanoid prepare to attack Wander, but he easily repels them waving the "Ancient Sword", which emits strong beams of light. After suppressing the shadow creatures, the voice of a disembodied entity known as "Dormin" echoes from above, expressing surprise that Wander possesses such a sword. Wander requests that Dormin return Mono's soul to her body, which he says is possible if the sixteen idols lined up in the hall of the temple are destroyed. He explains that this task can be accomplished by using the Ancestral Sword to kill the sixteen colossus located in the region that are the embodiment of the idols. Each colossus contains a portion of Dormin's own essence, although this is not revealed until the final moments of the game..
Despite the warning from Dormin that Wander may have to pay a heavy sacrifice to revive Mono, Wander part trip through the area looking for the colossus to destroy them. With the death of each colossus, his physical appearance deteriorates: your skin gets paler, his hair darker, dark scars on your face and grow up to an apparent growth of horns on his head. Meanwhile, the appearance of Mono progressively improving and your voice can be heard softly in the scene after the death of a colossus. After the death of the 12th colossus, is revealed to the player that Wander is being pursued by a group of warriors led by a shaman named "Lord Emon".
Rushed to finish his task by Dormin, Wander soon part to defeat the 16th and final colossus. On the way, he travels with his horse on a long bridge, which begins to fall apart when they reach the halfway point. When Agro jumps over the last failure of the bridge, the portion in which she falls begins to separate from the whole bridge, almost unbalancing. Sensing the impending fall, Agro throws Wander to safety on the other side, sacrificing himself as the bridge collapses and she falls into the river many feet below. Wander sadly meets the colossus final and the group of Lord Emon comes to Worship Temple shortly before the last idol crumble. Wander appears soon afterwards, his eyes now and totally pale skin and two horns coming out of his head. Declaring that Wander has been "possessed by the dead", Lord Emon orders his warriors who kill. While he struggles to reach Mono, one warrior shoots an arrow in his leg with a crossbow, while another stabs him in the heart with a sword. Black blood spurts from the wound while his body is covered in darkness and falls to the ground - a similar death to that suffered by the colossus.
Then the spirit of Dormin seizes Wander's body, transforming it into a shadowy giant big horns. They explain that his body was fragmented into sixteen sides - the colossus - to seal his power, and that they now had taken the body of Wander and reborn with each component of the essence of Dormin being stored in the body of the protagonist . While the warriors flee, Lord Emon throws the Ancestral Sword used to kill the colossus into a small pool at the bottom of the temple hall, creating a whirlwind that consumes Dormin and, consequently, Wander. Emon and his warriors flee the Forbidden Land as the bridge leading to the temple collapses behind them. When they arrive at the entrance to the security area, Emon expresses hope that if Wander survived, he can redeem his actions.
In the temple, Mono awakens, revived by Dormin in fulfillment of the agreement with Wander, and Agro comes limping in the temple with an injured hind leg. Mono follows her to the pool for which Wander and Dormin were Emon sucked into the spell, finding a newborn with small horns on his head. She takes the child with him, following the horse to the upper floors of the Temple Worship and coming to a secret garden inside the temple.