Dark Release

The jutsu are techniques that can be used to absorb, manipulate, and release chakra taken from an opponent. It seems that techniques of this element are channeled through a mark on the user's left hand. This mark resembles two squares, one overlapping the other vertically. Chakra is absorbed through the upper square, while it is released and manipulated through the lower. The elements combined to create this nature are unknown. To date, this form of nature manipulation has only been used by Hiruko, who obtained it using his Chimera Technique to steal kekkei genkai in Naruto Shippūden 3: Inheritors of the Will of Fire from an unknown shinobi.

Trivia

 * The mark on Hiruko's palm also appears on the back of his three subordinates, suggesting that it is rather related to the Chimera Technique.