This technique uses Iron Sand to create a gigantic sphere of branching spikes. The user first creates two masses of Iron Sand of opposing magnetic fields and then merges them together. This causes the magnetic forces to instantly increase and the repellent force created by the two opposing magnetic fields scatters the Iron Sand across a vast area.
The Iron Sand spreads in spikes that branch off irregularly, making it almost impossible to get a clear overview of what is happening. This also makes evading the spikes nearly impossible. Even if the opponent has managed to evade getting hit, the Iron Sand spikes will have filled the entire surroundings, cutting off any escape routes. With the opponent trapped, the user is free to attack in person.
With Sasori soaking the Iron Sand in his lethal poison, the technique is even deadlier, as one nick will bring fatal repercussions.