Capítulo 115: She Excited Him

Fae are powerful because they are not like humans driven by emotion. Of course, they do feel emotion but are mostly superficial at best. The only emotions they do feel deeply are those steeped in passion; rage, lust, and love. All others are shallow and fleeting. 

Because of this, their kinds are very egocentric and tricky species. They enjoy pranks and self-gratification because it grants them a brief period of feeling. After the emotion wears off they seek it again.

However, Aldric has a different view on that theory, perhaps, they intentionally turned off that aspect of feeling because the emotions are heightened for them. It was their way of combating such raging emotions, not to mention 

for a dark Fae like him conflicted between the feelings of good and bad all day.