Why did it feel so relaxing? Why did you feel the terror and panic wash away from you? The lavender fields of flowers, rolling on and on forever. What the hell happened just then? You were running away, trying to escape the city drenched in purple.
However, now, you were in a lovely field of lavender and purple flowers and grass. The sky was just the same color as the ground you were laid on, completely clear with no clouds or even a sun, yet it was still lit.
X!Toriel: "You seem to have awoken, child."
A strange, anthropomorphic goat-like creature appeared in front of you, sat on the stump of a tree. There were trees on either side of her, with purple leaves and lavender bark. She seemed like that queen of the Underground... Toriel, that was her name, but she looked different. She had a dark purple crown, robes with purple and white, and black eyes with purple pupil.
In fact, now, you forgot all about what you were doing before this, just like a bad dream.
GASTER: I SUGGEST YOU RUN AWAY. THE CLOSER TO HER SORROW, THE STRONGER THE ILLUSION GROWS.
So why the hell did you feel so... scared?