Kekkei Mōra

is a term used by Black Zetsu in the Fourth Shinobi World War. When Kaguya Ōtsutsuki summoned a huge Truth-Seeking Ball, Zetsu mentioned that it encompassed all natures as well as Yin-Yang Release. He describes the Truth-Seeking Ball as and further noted that it could be used to create a new space.

Known Kekkei Mōra
The only technique that is known to be a Kekkei Mōra is the Truth-Seeking Ball, which can permanently damage reincarnated shinobi and possibly kill them due to negating their regeneration. Its also highly malleable, able to be used as both offence and defence and be shaped into different weapons and forms.