Factions was by far my favorite expansion, and I've always been curious: what exactly are the envoys? They "shepherd the dead" but what is their relation to Grenth, if any? Do Canthans go to a different place in the Mists when they die? And who/what the heck is the Oracle of the Mists? Does he have any relationship with the human gods? He always seemed so powerful.
From a design standpoint, I'd really like to know how the "cosmology" of Cantha was developed - it's inspiration, etc. It always felt so different from the typical gods stuff, and I really enjoyed that. Either way, kudos to everyone who developed the lore of Cantha