Board Thread:Theories and Speculation/@comment-30787246-20161219014910/@comment-1872728-20170108075820

To me, this is the Senju Sage Mode, a special Sage Mode that is passed down in the Senju Clan, and only the most gifted can use it. I came up with this by examining the abilities of the Senju, Uzumaki, and Uchiha, as well as Asura and Indra.

I found out that the descendants of Asura and Indra both had 3 abilities, where Asura has abilities based on plants, and Indra has abilities based on animals. One of them is the senjutsu and dojutsu ability, the other is the biological manipulation ability, and lastly the chakra structure ability.

If Uchiha inherited the dojutsu (Sharingan) and chakra structure (Susanoo) ability, then they would have the biological manipulation ability left, which is the Shikotsumyaku of the Kaguya Clan.

Uzumaki inherited the chakra manipulation (Adamantine Chains) ability, so the Senju would've inherited the biological manipulation (Wood Release) and senjutsu (Senju Sage Mode) ability.