Cardinal Sin (formally Antoria) is a boss that the player faces in Dharma Temple in the game Dragon Quest VII.
The Demon Lord understood the importance of Dharma temple because of its potential to create a Hero. The Demon Lord sent Cardinal Sin to take over Dharma. He commanded monsters and overtook Dharma. Many of the Dharma Guardsman were killed. Jacqueline the High Priestess, was captured by the monsters and imprisoned in the Dharma prison, encased in a pyramidal energy field, powered by two magical conductors.
With the monsters finally taken over Dharma, Antonia comes up with an ingenious scheme. Knowing that travelers would come to Dharma Temple to change classes, Antonia decides to steal their skills. How it works is simple. The traveler comes to Dharma Temple coming to change classes. The monsters, disguised as priests, pushes class change onto the unknowing traveler, telling them about the advantages of changing their class. When the traveler is sold on the idea of changing classes, they go to the High Priest, which is actually Cardinal Sin in disguise. Cardinal Sin asks a unsuspecting traveler what class they wish to become. When the traveler makes their choice, Antonia first asks the traveler to bathe in a pool behind him. When the traveler bathes in the pool, Cardinal Sin reveals his ruse. Bathing in the pool seals the travelers abilities. With the traveler powerless, he is sent to Penal, a town filled with the tricked travelers. It is cut off from Dharma Temple by mountains and connected by a long cave.
In Penal, the travelers are trapped by the monsters with no way out. Pushed to the brink, the trapped people turn against each other. Those who relied on strength before being tricked by Cardinal Sin and the monsters usually attack the people who relied on magic. Should a person try to leave Penal, the only way out would be to go to the cave. It is a long cave, covered in marshes. On the fourth floor, two powerful monsters, Rashers and Stripes, guard the floor. They are given some of the power stolen by Cardinal Sin which makes them near unbeatable.
To further torture the people, the monsters tell them that the only way to recover their stolen powers is to use a weapon known as a Soulstealer (formally SoulSword) . A Soulstealer is the manifestation of a person's soul made into a weapon. It allows the user to harvest the souls of the trapped people in Penal. The people whose souls were harvested are taken to a settlement cut out of the mountain. There they guard the priests who weren't killed in the battle for Dharma.
The people whose harvested the five souls required to return their stolen powers are taken into a battle arena under Dharma. There they are told that in order to gain their freedom, they must fight in five battle matches against others who have had their powers restored. The monsters require that the the fighters make groups of four but because the warriors do not trust one another, they choose to pair up with monsters. They must win five matches and then defeat the current champion. Should one person complete this task, monsters arrive and escort them into Dharma temple's interior. There, they are taken before Cardinal Sin.
Cardinal Sin reveals why he did what he did. Stealing their powers strengthens the Demon Lord. Furthermore, the battle arena increases the rate that the Demon Lord gains strength exponentially. Cardinal Sin reveals that he will not allow people to escape and those who complete the battle arena are destroyed by Cardinal Sin personally.
They enter Dharma Temple and talk to Cardinal Sin, who has disguised himself as the High Priest. He asks them to bath in the pool behind him before he changes their classes. When the party bathe in the pool, their powers are stolen from them. Cardinal Sin reveals his ruse and sends the party to Penal afterwards.
The party returns to Dharma Temple, having recovered their stolen abilities. They arrive to see another warrior talking with Cardinal Sin. The warrior demands his freedom, stating that he had won the tournament. Cardinal Sin agrees that he had won the tournament but reveals that it was all of the sake of strengthening the Demon Lord and himself. He burns that warrior until there is nothing left. The party goes up to challenge Cardinal Sin. With Fosse's help, the party finally defeat Cardinal Sin and liberate Dharma.