What does diligence actually work on?

Thanks for all the help guys!

Just to reconfirm, the special scrolls are only the enhancement/potential scrolls?
I was thinking that the regular scrolls were actually scrolls that didn't have the note that it would work for Vega scrolls (i.e dark scrolls/etc wouldn't work)

Is there any evidence (either data/report from nexon that confirms either)

--> I'll edit my post so people don't have to read the whole thread for answers

chaos, clean slate, etc count as special scrolls as well. Locked/Danny posted the list somewhere but if you suspect it to be special, it probably is.