Apparently, magic had fallen out of favour long ago, and most people who had the gift for it never knew it, or explored it, or were even killed. This time, he directly pulled some of the remaining wild magic into himself. Even his freshly strengthened body felt like it was burning when he poured wild magic into it directly, without any aim. It was wreaking havoc on his insides. Every organ and muscle felt like it was on fire, very similar, but substantially weaker compared to the cruciatus curse. However, his mind stayed detachedly focused, and he started channelling self-healing with all the new magic inside of him. Once the rampaging magic inside him ran out, he simply grabbed more from the outside. This torturous exercise continued relentlessly, making his body get used to using and controlling magic and further strengthening his body in a cycle of destruction and healing.