"Soul Binding is a rarely used Pureblood matrimonial rights ritual. In some cases, in order to strengthen the magic between families and ensure a strong lineage, the betrothed would be tortured into extreme states of magical energy, until a magical bonding was ensured. As this practice could lead to the death of many witches and wizards of Pureblood lines, this practice was deemed illegal, but often continued to be done in secret." 