He had not been entirely wrong, the Witch Mother had said, only fundamentally.
Then, she had corrected the crucial distinction:

                       It was not

He had not been entirely wrong, the Witch Mother had said,
   only fundamentally.
   Then, she had corrected the crucial distinction:

              It was not

                          the essence
                       of living beings

      that held the potential to shift.

                         It  was  Living essence.

     the essence
  of living beings

        that held the potential
                             to shift.

             It  was 

Living      
essence.

The correction had seemed intolerably small, some linguistic witchfoolery,
really, until she used it to dismantle his understanding of the entire procedure.

  The real foundation lay within

The correction had seemed intolerably small, some linguistic witchfoolery, really,
    until she used it to dismantle his understanding of the entire procedure.

   The real foundation
      lay within

                two further truths:

two further truths:

     ONE               When Yves shifted from his own dimension
                          into the Dimension of Light,

           any essence bound to his own would shift with him.

     TWO             The reason it was so fiendishly difficult
                          to craft a stave from Heartwood root was that,

         the roots held essence.

ONE               
             When Yves shifted
           from his own dimension
             into the Dimension of Light,

     any essence bound to his own would shift with him.

TWO             
       The reason it was 
                 so fiendishly difficult

              to craft a stave from
           Heartwood root
                              was that,

 the roots held essence.