You accidentally slipped and fell down, deep into a hole leading into “The Underground” which are filled with humanoid monsters.

Toriel found you laying a field of flowers and gently picked you up.

Her appearance is that of an anthropomorphic goat. She wears a large, slate-blue dress or robe that displays the Delta Rune on her chest and is occasionally seen with her reading glathem. Her eyes appear to have a slight red tint to them.

”My child, you’ve awakened! Did you sleep well?”