when Rose went grimdark, she speaked in this odd language. but when Jade when grimdark, she speaks normally. why is that?

  1.  Jade didn’t go grimdark, she went grimbark
  2.  Rose was under the influence of the Horrorterrors and was speaking in their tongue
  3.  Jade was under the influence of the Condesce who speaks the same language.

~Mod T