"Oh god... W-what have I done. I..I didn't mean to go this far. But I couldn't stop myself. I'm so so sorry," Eli says to the lifeless body laying several feet in front of him. (This is after Eli agrees to the terms of the organization that helped him take down James and the organization does something to Eli that makes it hard to control himself)
Faeries have blood like liquid gold, so when they bruise, it looks like they are perfect Greek statues dusted in gold leaf. Of course, that does mean there are the cruel few who take pleasure in hurting them just to see the beauty. The fairies are wise in that they have come to know through experience that everything has two sides; beauty, after all, has caused them pain.