Hmm, so far I'm neutral to these:
1. You can get so many Enriched Ori & Elu from doing the Forsaken Dungeon Quest.
2. As for the Memory book, you just have to have more patience. Agav isn't that hard to kill, they are many too in ra_san05.
But not to this:
As for the Hero's Remains, yeah that's a pain to hunt. Most high players just keep on hunting Hero's Remains and selling them.