Official witches are equivalent E and D-rank degu users. Their curse knowledge and curse energy realm were matched, which enable them to use E-rank and D-rank spells. That's why being a witch was far more difficult than simply being a degu user.
Though it has its advantage, as they are far more versatile because they can learn numerous curses, unlike degu users who only have a few abilities corresponding to their rank.
Not anyone can become a witch. First, one needs to be a witch, obviously. Because women have a special type of DNA that is unique to them that Niki used to convert the degu energy to curse energy. Second, one has to be smart or have a passion for studying. The power of witches comes from their knowledge. The more they know, the stronger they can become. And lastly, witches are a nightmare-level path. Since one still needs to not only become knowledgeable but also improve their realm.
