He is a God of Nightmares. Ash remembers all he sees in others' dreams but...hmm, perhaps it may be best for him to explain it when you meet again.

[His words are broken but in turn Grimm could not explain that empty loneliness the Nightmare King felt. For a dream to move him, be registered as something he liked and not one of the countless grans of sand that fall in the hourglass...it does mean something.

But Grimm's expression turns concerned when she mentions that the other dreams she saw were scary.]

Do you wish to speak of what you saw? I do want to talk about your parents as well, but...