Naraka Path is one of the Six Paths of Pain that summons the summoning the Outer Path for interrogation. He was a wondering monk while alive.
Naraka Paths (地獄,Jigokudō) could summon the king of hell and can grant the user two main abilities: interrogation and restoration, by holding the tongue of its selected victims and the one who tells the truth lives the one who lies have there tongue along with there soul taken out.
Naruto X UT (OVA)
A short Naurto Shiuppuden OVA movie