A level 8 moon story has white letters saying 'level 8', and levels 12,15, 18 have light yellow letters, and then levels 20 to 30 have dark yellow letters. As difficulty increases does the quality of the drops get better; better chance for purple rather than the huge amounts of green and blues? Having asked that, I seem more likely to get a purple drop when doing a mission and killing a level 8 enemy rather than when I kill 250 level 30 enemies in a daily story.