User blog comment:B214/Volume 22 spoilers/@comment-207.96.205.3-20161013163608/@comment-26926813-20161013191845

Author said in afterword of Volume 21 that Trihexa is the most destructive force in DxD equal to serious GR, or Ophis in her prime, if not a stronger

Maybe Trihexa stronger but as say Sky-Dragoon-Twilight it stupid like beast, compare to GR and Ophis who have a normal mind.