Although Di Tou certainly didn't become an expert in poison, as he simply hadn't been exposed to enough kinds of poison, nor was he very good at applying them to other people, he had grown quite the immunity, helping his thick skin go through another evolution! At the same time, it could be considered a refinement of Di Tou's fine motor skills, seeing as he was able to not only rub the tip off of a needle, he could also carefully apply the smallest dab of poison to the needle, causing the metal to smoke and soften, before combining the two needles together in a way so that their points wouldn't stab him later down the line…