I think I discarded the first one I recieved, I found a few more but is the quest unavailable to my character since I made that mistake a few months ago? I discarded it because I had no clue what it was for and didn't realize stuff like it was important in this kind of game.
-
Yes, you will be able to continue to collect the DVALIN relics as random loot drops from defeated enemies. Best of luck, Guardian!