I'm on the camp that believes that
the Gems of Doom are bad news (I mean, WHY would they even be called Gems of Doom in the first place?), and that collecting them all could lead to some bad stuff happening in the future. As to what it is, well it's still unclear at this point since there's hardly any clues about the matter. What IS likely is that dear ol' Wyatt might know, since he's been hard-pressed in finding them even though he's no longer part of the living.
I mean to be fair, have you seen Calypso? Girl's obviously powerful, but she's way too arrogant and likes to flaunt her stuff when you set her off (see:
that poor Innkeeper getting a taste of Calypso's wrath during Orion's Bleeding Case). Not really hard to capture someone like that, just make sure you make her angry enough that she'll tunnel vision to your direction and have the Praetorians swoop in to knock her down.
Also, there's yet any evidence I've noticed that could point to the idea that
Calypso's backstory might be fabricated. However, I have a nagging hunch that - given Calypso's haughty, arrogant attitude of loudly proclaiming herself as the greatest good you're ever gonna get (j/k I mean the most powerful, the last of her line, yada yada) - her people might have sold her out, and she's not aware of that fact. Which could be another explanation as to why she was easily captured by Ulysses despite her supposedly impressive abilities.
I had a different interpretation of that moment (though it's probably my bias against
Idriel at work). I felt like she's
goading Orion into doing what he needs to do, that he shouldn't waste his time and instead put all his efforts in remembering whatever she wants him to remember and breaking the chains, whatever that might mean (though all signs point to that line either referring to the dead being in some sort of metaphorical chain and she's ordering him to break those...or, if you're on the "Orion is in a time loop" camp, she's referring to the loop that he's in and that he has to break it).
As for why an entity like her would do that, maybe it's like an unwritten law of the universe thing. Or like Bruce Almighty where the rules of being God states that you can never force someone to love you, that kind of shit. Maybe she couldn't do what she has to do even if she tried because her hands are tied. Or maybe whatever she wants Orion to do has the potential to backfire, and rather than get her hands dirty she wants Orion to do the dirty work and then swoop in later to reap the benefits once he's outlived his usefulness.
My personal theory is that
the Founder didn't create Eternum, but he certainly created and planned the means for humanity to reliably get there as well as live there. The implants, the hub worlds where humanity could safely travel to and work without fear of being attacked by the natives of Eternum, the NPCs that act as a means to support the player and provide them tasks to do in the form of quests, the exit portals...those are stuff that he and his company had a hand in. Finally, he conceptualized the idea of selling the experience as a "game" to mask the truth that he's just basically using all of these clueless chucklefucks as a self-sustaining army of willing scouts to brave whatever dangers await the vast worlds just to find gems for whatever personal reason he has for them.
As for Idriel, I feel like she's to the Founder what Calypso is to Orion: a powerful being native to Eternum that is aiding him in whatever quest he's got himself into, but is by no means close to him, and is someone who happens to have a personal agenda that she prefers to keep private from her supposed partner-in-crime. Probably not a goddess tho (though I could be wrong)