I Am a Rock
It is a mechanical humanoid Stand that causes any specific object to converge toward anyone Yotsuyu touches.
I Am a Rock is a humanoid Stand of a height similar to Yotsuyu's. Its shoulders and upper arms are limited to thin pipes. Long shoulder pads, fixed to its torso, bear short, evenly spaced spikes; along with its chest, head, a transparent dome covering its head, and the back of its hands. Its head is smooth and featureless except for its spikes; eyes vaguely articulated by muscle or brow around it, and a small, thin-lipped mouth. In conjunction with its very thin waist, its legs appear to be in the shape of hammer pants.
I Am a Rock is a close-range Stand, unable to travel far from Yotsuyu and with a short ability range. In terms of speed and power, this Stand is capable of overpowering a human-like Karera Sakunami, but despite Yotsuyu's confidence in a frontal assault against Josuke, Soft & Wet is able to overwhelm I Am a Rock in a fistfight.
Thus, Yotsuyu prefers to let his Stand's ability kill the target rather than openly confront them.
When Yotsuyu touches someone, the victim begins to naturally attract specific objects toward them.
After being touched, the victim will have objects slowly converging toward them with exponential speed and strength as the objects approach. The objects will eventually come in contact with the victim and push into the flesh toward the center of the body. Every time the power is activated, the victim will attract only one type of object, for instance, flower pots, chestnuts, or cans of pesticide. The converging is inexorable; breaking the objects only results in more pieces digging themselves into the victim and the strength of the attraction is important, thus it is impossible to simply push away the objects. Yotsuyu can affect several people at the same time with the same type of object or affect himself, although he is then able to toggle the ability. Yotsuyu can choose what kind of object will be attracted to the victim.
Yotsuyu typically attacks someone by using I Am a Rock in conjunction with his Rock Human physiology. By hiding in the landscape as a rock and then stealthily touch someone, he can simply wait until the victim is overwhelmed by the converging items and repeat the process if it fails.