Name: Shuurajou, 修羅場 - (A Scene of Carnage)
Type:: Kinjutsu, 禁術 - (Forbidden Technique)
Rank: S
Abilities Gained: Known as Keen's most revered skill, it allows Keen to steal body parts from an enemy by either ripping it out of their bodies or by devouring them (dead or alive) and integrate them into himself. After having consumed the vessel, these corpses become a puppet in which Keen can use later on. Upon stealing a heart, they are stored within his body, granting him vast amounts of chakra (not elemental affinities) and allow him the use of a spare heart incase his own is destroyed.
These hearts that Keen has collected retain their kekkei genkai but can only be used when equipped with a body to act as a conductor. When first summoned, Keen will spit-up one of the hearts that he has stolen. Muscle and flesh of a specified corpse will then form around the orb along with bones and other organs. After only a few seconds, the corpse will be completely formed. This technique can be used to summon multiple corpses at once, depending on the amount of hearts Keen has obtained. The corpses are almost impossible to kill by normal means. If a limb is destroyed or removed, it will simply sew itself back together or steal a limb from another corpse.
Disadvantages: In order to give his corpse’s new life, Keen is forced to give up one of the hearts he has gained in order to control them. To destroy the corpse, the heart has to be removed. Once this is accomplished, the bodies will return to their powerless puppet-like forms.
Other Effects: Having used this on his own heart, Keen was able to reincarnate himself into a corpse composed of multiple children. It is this technique that has made him into what he is to this day.