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 technique. It was seen only in Naruto the Movie: Blood Prison and Ryūzetsu was the only known user. Other details, such as whether it was common or rare and whether any other technique could be performed using it, are unknown.

Ryuumei Tensei Kekkei Genkai Ryūzetsu