Answer:
I have four legs but no tail. Usually I am heard only at night.
Scythe of darkness, Shadow’s light. Guiding eye of thirteenth sight.
Thirty white horses on a red hill, First they champ, Then they stamp, Then they stand still.
Different lights do make me strange, thus into different sizes I will change
A word I know, six letters it contains. Subtract just one and twelve remains.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.