Hagoromo:
"Eternal Tsuki isn't just a genjutsu".
You need the 9 tomoed rinnegan , but it isn't just about eyes.
"It also uses their powers while keeping them alive"
The tree's life force and absorption ability are needed.
Now , look at the 3rd draw:
Someone casted "ET" , and Hagoromo talks about Kaguya's 3rd eye in the next draw.
Kaguya casted "ET" on the 3rd draw.
But , The tree's life force and absorption ability are needed.
So , Kaguya had become one with the tree.
"Eternal Tsuki isn't just a genjutsu".
You need the 9 tomoed rinnegan , but it isn't just about eyes.
"It also uses their powers while keeping them alive"
The tree's life force and absorption ability are needed.
Now , look at the 3rd draw:
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Someone casted "ET" , and Hagoromo talks about Kaguya's 3rd eye in the next draw.
Kaguya casted "ET" on the 3rd draw.
But , The tree's life force and absorption ability are needed.
So , Kaguya had become one with the tree.