The Seven Deadly Shinobi was an organisation(Originally the twelve divine shinobi) that studied the ancient legends of The 12 Guardians Of Existance, after spending years of searching they finally arrived at a sacred ruin that was said to bestow divine powers onto those who could find it. however their study was wrong, the temple was actually a place of sacrifice to the guardians. Due to this mistake they lost five members and decided to make their own jutsu through experimentation. They then became the seven deadly shinobi.