To make the restrictions even worse the technique could only be practised with someone that has dual martial spirits of fire and cold nature, if not then the person wouldn't be able to handle the energies inside them and go wild before theory even filled 20 of their acupoints.
Despite all this Dante was still drawn towards this technique. Dante already had the fire attribute martial spirit that was his Red Dragon Soul needed for the technique, and while Dante didn't have a cold attribute martial spirit, Dante had something else that he believed would work just as well if not better.
His bloodline.
