This article, Assimilation: Sand Binding Coffin, contains content taken directly from our mother site. All credit of such content is reserved the original authors over at Narutopedia, the original article can be read here: "Assimilation: Sand Binding Coffin" .
This technique is a copy of Gaara's Sand Binding Coffin by Nagare, with the difference being rock powder instead of sand. However, Nagare needs to use Assimilate All Creation Technique before he can use this techniqque. The powder encloses the opponent and then crushes them, killing them.