Galdjent Viis and mystel- what's behind those names on the first?

[Vyrerus]

Adoulin really did take an interesting turn there. Unexpected Lovecraftian-style horror with the introduction of Ra'Kaznar and its denizens - all threatening largely due to their sheer alienness, and corruptiveness. But yeah, it was all NEW lore, rather than expanding on old stuff. I do consider Kindred to be a variety of Beastman, however; like Beastmen in the game, they have jobs (Warrior, Black Mage, Dark Knight, and Summoner) which other monsters (including other demons) do not. They're clearly associated with the Dark Divinity, but I don't think that they completely depend on him. As you say, though, the lore of the game never makes it clear.

On the topic of Void Dragons in FFXIV, whether the FFXI-inspired ones or otherwise, Voidsent almost never are transported between worlds in bodily form. They come across as spirits, and then kill/possess/inhabit native creatures to become the Voidsent we encounter in battles. So, even if a Void Dragon WERE called to another shard, they probably wouldn't be able to take their Source-dragon body along with them. They'd need to abandon it, and occupy some other creature on the Shard.

Again, though, they COULD bring knowledge along with them in doing so, which is a possible explanation as to how the Drahn race was named. Maybe.

I mean, again, sort of. We know that dragon bodies CAN cross the rift. Hraesvelgr and Middy confirm it. The Hydra bodies in world of Darkness confirm it too. Unless we're gonna jump on the ship of hydras aren't dragons. But there are also a lot of other Voidsent that cross onto the Source in Eureka with the only explanation being they sensed all the tasty aether and hopped on over. I'm under the assumption that the dragons we see in Eureka came across the void as all the other voidsent did.

We get this from the Fafnir fate:

"As the old saying goes: every wyrm's ending is just a voidsent wyrm's beginning. Banish this particularly vicious example, and remember that no one's to blame—except the adventurers that killed the high dragon whose dying breath summoned forth this monstrosity."