C4

With his clay, Deidara creates a giant doll that looks like him. When it ruptures, a cloud of microscopic bombs are released. Impossible to be seen by a normal person, the bombs will enter the bloodstream of anyone who inhales them. Once there, the countless micro-bombs explode at Deidara's command, causing the victims' bodies to disintegrate at the cellular level; literally turning them into dust. According to Deidara, he created C4 for the sole purpose to defeat Itachi, to combat his Sharingan and the genjutsu it could create. In creating this technique he eats the clay with his own mouth as opposed to the ones on his hands.