I was replying to another topic, and in working out some aspects of canon I went on a riff and it hit me like a ton of bricks…
Ok, I’ve been connecting the dots and I have to give it up to the writers for including all the details regarding the Leeching, Crystals, Anointed, & Eridium. I hadn’t put them all together until now.
In BL3 they have a Full Metal Alchemist-type explanation for Pandora’s creation. If you are familiar with FMA they use human sacrifices to create a Philosopher’s stone, which in that series is a magenta gem that gives the wielder supernatural power to bend matter to their will.
Nyriad basically does the same thing the main villains in FMA did, and transmutes an entire population to create a powerful gem. Pandora is an Eridium sphere capable of holding the Destroyer. It’s a giant hollow philosopher’s stone.
It’s very dark, and maybe too on the nose, is that Eridium is called such because it is literally composed of the matter and energy (Dare I say spirits) of the actual billions of Eridians sacrificed to trap the Destroyer.
The husks Tyreen leaves behind have crystal shards jutting out of them from her power leeching. I sort of figure it was because they were eating unrefined eridium before she leeched them (like the patient he has in Sanctuary at the start of BL2).
Considering she inherited Nyriad’s power, which is was trapped in the Nekrotafayo Vault, she is actually doing a similar thing to what Nyriad did to the Eridians, except instead of infusing the crystals with the life force of the person she leeches, she keeps the power.
If Tyreen were to infuse the crystallized husk with the power, like the Anointed are, then the end result is they would turn into Eridium (which the Anointed do once they are killed).
Those aspects of the lore and a game mechanic are very well woven together, but if you don’t get to know those Eridian Writings and get the connection between all the things that they mention along with these otherwise minor details of the game, it’s just stuff that you take for granted.
If you didn’t catch all the echoes and character dialogue this content creator does a good job compiling it all and putting it together in biographical format for the key characters in this aspect of the plot and npcs that play key parts.