For those who may be interested, I have recently posted a revised and updated version of my "Runiverse" fluff documents over on BGG.

Link here.

Steve-O said:

Thank you ! 

Steve-O said:

This is just outstanding stuff. Thank you for sharing this!! For those who enjoy the "narrative", this is extremely helpful information to have collected, organized and written up so skillfully. Wow! Well done, Steve-O!

BTW, I don't see references to RuneAge nor to DungeonQuest (which also take place within Terrinoth's environement).
I presume that those two references would add to the "fluff"…

Robin said:

There are a few references to those two, but not very many.  DungeonQuest doesn't have any flavour text to speak of, aside from the introduction and the hero backgrounds, so the only real additions it contributes are in the characters of Kalladra and the six heroes it comes with.

Rune Age likewise doesn't have much to offer in the rulebook in the way of flavour text.  I don't own that game personally, but the cards don't seem to have very much text on them at all.  (If anyone who does own the game is willing to transcribe any fluff text from the game components, I'd be grateful.)

Drakon is another game that technically belongs to the Terrinoth club (the heroes it uses are the same as the heroes from Well of Darkness) but that game has literally no flavour text.  The heroes aren't even given names properly.  Some games give us more information than others.