Quote Originally Posted by Rubedo
chaos: If you don't mind, I will take the turn...

Rubedo:

Just by knowing the name
You can tell what it is about
It supports the theory
And is truly inevitable
One girl tried to change it
Yet she failed

What am I?
Line 3/4 - probably the R=U theory.
Line 5/6 - referring to Ellone reaching into the past and trying to change it, but failing.

I'll go abstract and just say "the past".