Introducing Marvellous Mystic the Unicorn  
-Mystic’s Cutie Mark is for her understanding of Dark Magic  
-Mystic is one of Equestria leading experts on Dark Magic only behind the likes of Princess Luna or Sombra.  
-Mystic gets annoyed when others assume that dark magic equals evil. Dark magic is just magic fuelled by powerful emotions.  
-Mystic mainly deals with research in the field helping find ways to help protect others from who have become effected negatively by it.  
-Everytime a new researcher comes she can’t help by prank them by making her eyes glow freaking them out. The regulars always look forward to seeing the newbies reactions.  
-Mystic works quite frequently with Princess Luna