R I N N E G A N
I now all the sanins have a really good realese like J-mans HM and Tsunda's Seal thing so what Oro's.
There has not been a "mode" of any kind really for Orochimaru that matches the Sennin Mōdo and the Sōzō Saisei (Genesis Rebirth).
Spoiler:Though I suppose you could count his "true" form to be something of a special ability, yet its level is not necessarily matched with the aforementioned.
Which would be this