Story-mode Dungeons
unlocking exploration mode and…that’s it
The story mode dungeons basically familiarize you with the characters from Destiny’s Edge. You will not be able to finish your personal story without doing the Arah dungeon story mode, so until then, for roleplaying and story reasons, it would be nice to do all the previous dungeons. I also recommend to do them in their natural order, because doing them at random would be like reading a book from the end towards the beginning, or something similar.
Awesome, thanks for the responses. =)