The Crystal Empire
... that the design of King Sombra, the villain in "The Crystal Empire", was meant to illustrate him "as both a solid creature and a flowing mass of smoky darkness"?
... that the design of <a href="./List_of_My_Little_Pony:_Friendship_Is_Magic_characters#King_Sombra" id="mwBic" rel="mw:WikiLink" title="List of My Little Pony: Friendship Is Magic characters">King Sombra</a>, the villain in "<b id="mwBig"><a href="./The_Crystal_Empire" id="mwBik" rel="mw:WikiLink" title="The Crystal Empire">The Crystal Empire</a></b>", was meant to illustrate him "as both a solid creature and a flowing mass of smoky darkness"?