She never knew exactly what form the gateway would take. Only that it would fit the theme of the dream, or in this case, nightmare, as the material transmuted itself into an old, thick, rusty metal door fit for a dungeon. Thinking on it, this dream's framework reminded her of the tales parents would use when she was but a filly to scare their foal into compliance. Grogar, the Vile Father of Monsters in particular, going by the decrepit state of the dungeon. 