Curse Technique: Death Controlling possessed blood

The technique requires two special conditions: One being that Hidan 
must have drawn an insignia of Jashin on the ground in his own blood, to
 which he must remain in the centre for the technique to function 
properly. The other being him to acquire and ingest the blood of his 
intended victim. Once ingested, his skin then turns black with white 
markings which makes him look like a skeleton, a symbol of absolute 
death. This serves as the link between him and his victim. 
Once his sacrificial ritual takes place, the victim is linked with the caster
 until he either steps or is forced out of the circle. Any kind of 
injury that Hidan inflicts upon himself (or the injury they inflicted on
 him) is reciprocated on his target, be it a mere scratch to a pierce in
 the heart. If Hidan is forced to step out of the circle, the link is 
temporarily broken and the victim is set free, but only as long as Hidan
 has stepped out of the circle's reach. Basically, this technique makes 
Hidan a living voodoo doll.