Ryūzetsu's Kekkei Genkai

This unnamed Kekkei Genkai apparently allows the user to perform Reincarnation Ninjutsu as it allowed Ryūzetsu to perform the Dragon Life Reincarnation jutsu. It was seen only in Naruto 5: Blood Prison and Ryūzetsu was the only known user. Other details, such as whether it was common or rare and whether any other jutsu could be performed using it, are unknown.

Trivia
This is one of the few movie-only kekkei genkai, the other known ones being Dark Release, Steel Release, and Swift Release.