User blog comment:Martialmaniac/Illumi's necromancy/@comment-4828844-20151021095057/@comment-5780397-20151022214945

In Chapter 328, you can see the needles he uses to create Needlemen are different from his usual ones. He himself stated that having to use them is a pity, and it was clearly the first time Hisoka had seen them, even commenting on their aura, which means they have mor ethan Illumi's usual needles. The people that caused the car accident that threw Killua's car in the woods had Illumi's normal needles in their skulls, but when he pulled out his "Needlemen" needles (so many needles, sorry), it was pretty obvious he had not used them before while chasing Killua.