Talk:King Sombra/@comment-1031724-20160930005148/@comment-27161581-20160930231119

Keep in mind Sombra was more of a test for Twilight, and wasn't clearly labeled as a threat until the mane six were already at the Crystal Empire. It was more of an exploratory mission than an act of conflict.

For additional logic, keep in mind that the Crystal Heart was the thing keeping the blizzard from freezing everyone as the Season six opener indicated, so if the ponies did use the elements of harmony to defeat Sombra then the Crystal Empire would be quickly engulfed in ice and snow.