Riddle
Two brothers if twins
Must be fraternal
One path facilitates
The other hinders itself

Hints:

  • The twins are opposites.
  • The answer deals with materia, more presicely it involves mastering materia.
  • The answer is a pair of materia, but not these two. Check my previous hint.

I'm gonna guess Black and White Materia. But, I'm not positive. Would facilitates means helps in any fashion?