Heaven's Dark Guardians

The Heaven's Dark Guardians (天恵 闇 保護者, Tenkei Yami no Hogosha) is a society of seven people who protect yet destroy. It's ironic for heaven to have dark guardians as heaven is a place for good people. They each represent a virtue.

Overview
The Guardians are believed to exist due to a certain being or something they needed to protect. They never stopped believing in themselves, thus being called Heaven's Guardians. However, in order to reach their goal, they would do anything, making them ruthless and called dark beings. Yet in Soul Society, they are called geniuses or angels due to their advanced knowledge of everything, however, it has been revealed that this was just a cover as Soul Society was afraid of them being too much of a threat, having no choice but to respect them. Some of the guardians have soldiers under their command. Each of them represents a virtue.

Training
The Guardians were feared for their neverending love for fighting, serving as great weapons. They were great swordsman, hand to hand combatants and Kido practitioners. When they have mastered all 3, they would have the reiatsu of what they call god transferred into them by a seal. After they learn how to master that reiatsu, they would have to learn to combine that reiatsu with their own, only creating a heavenly but dark kind of reiatsu. When all united, the guardians know a secret seal that would seal away one's shinigami powers forever.

Trivia

 * This is based off The Seven Heavenly Virtues.