if you know all the quest in RH you'll be able to understand this
here's the simplest way to gain dros earings using wallhack
1. kill 1st boss ratzel illusion(wind) (dont forget to do the quests after killing the bosses)
2. kill 2nd boss ratzel true form(wind)
3. go to drosins do the quest
4. find bookshelf unith's bookshelf
5. go to lightning room talk to the black flash armor
6. go to the last boss's room talk to the memory orb
7. go back to drosin's to obtain the drosin's earings (but sometimes it drops uchh)
and you're done