They are L-sama = Lord of Nightmare and Zelgadiss. In the former story "Zelgadis on The Couch", she promised him that she would leave only one cure for him and it should be found only by him. Zelgadiss, Lita Sorez and Prince Philionel go to Lara Sorez's mausoleum to study the painting on the ceiling and the hieroglyphs on the walls thinking that they appeared there by the will of L-sama. And there he sees.... I refered to the illustration by Mr.Kanzaka to draw L-sama's costume in this artwork.