Jigoku Hari (地獄針, Literally meaning "hell needles") was created by Renji in his effort to concentrate light stored in his body to the fullest extent to somehow form weapons that are made of light and have piercing properties, after concentrating the light as much as he can, Renji eventually failed and ended up with nothing more then a needle made of exetremly concentrated light. The technique however has one major weakness, as it greatly affects Renji's stamina after prolongued use.