You Know My Name

Question: Does Ra even have the power to unmake the world since Isis nut-shotted him out of his powers way back?

Ra's theoretical destruction of the world is an interesting case because, unlike most other pantheons' world-ending scenarios, it's not actually a destruction at all. The myth is not that Ra will unmake the world, either by blowing it up, tearing it down or even metaphysically taking it apart; the myth is that, if Ra chooses to go back to sleep, the world will just cease to exist without him, as it's his animative force that created and sustains it. It's less like Ra is a force that might choose to unmake the world, and more like he's a battery that might go dead and shut everything down in the process. What exactly this would entail isn't really addressed, so it's hard to tell whether the ancient Egyptians thought this would be a slow erosion of the world, things gradually disappearing, or just a sudden off-switch, but the gods are all pretty heathily terrified of the idea.

As for Isis, each game has to make a judgment call on what, exactly, she took from Ra. Clearly it wasn't all his powers, as he still has purview Avatars and Ultimate Attributes and is available as a Legend 12 god-parent. In fact, unless she wants to go about physically guarding the sun from Apep herself, stripping Ra of all his powers is definitely not in Isis' best interests, which is probably why the story of her poisoning and defeat of him specifically mentions that she took two things from him: magic (in Egyptian, heka or heku), which she distributed amongst all the gods, and the knowledge of his true name, which in Egyptian theology gives her increased power over him if she chooses to use it. Isis having access to Ra's true name doesn't necessarily mean that he doesn't have any powers anymore; in Scion terms, it probably means more that Isis has a guaranteed ability (or at least a big pile of bonuses) to stop him from doing something she doesn't like or to encourage him to do something she wants him to.

The myth itself comes from a time in Egyptian religion when Ra's popularity was waning a bit and Osiris and Horus were gaining ascendance, which makes it a neat explanation for why Ra is no longer running the show; making sure he wouldn't interfere in the royal rule of her husband and then son is exactly the sort of thing Isis would be likely to do. But Ra's still Ra; Isis can't unmake him, just try to control him with his name, so the threat of him taking all his toys and going home is still a very real one for the Pesedjet.

I think you could get some interesting stories out of the situation - Isis might be spending a lot of time and energy preventing Ra from peacing out and leaving the World to die, or enlisting the help of Hathor, who has stopped him before (or perhaps the ladies are at odds; Hathor, as a former Eye of Ra, might be more loyal to her father than her grand-niece, after all). Set is certainly historically much more loyal to Ra than to Isis' family, and they've never gotten along, which may drag the entire Set-Horus rivalry back into the mix. There are almost countless ways you could go with it, thanks to the byzantine mess that is Egyptian gods and their politics. It's even a good story, if you want, for Ra to make a bid to become a Titan Avatar, considering that he's already very old and primeval and that binding himself to a Greater Titan might alter his name enough to free him from Isis (although that, in turn, brings up the issue of an epic Ra vs. Aten battle, something that's been brewing on and off for millennia. Oh, dear).

But as far as I can tell from that myth, there's no reason not to think that Ra is still extremely powerful, as powerful as he ever was, most likely. All Isis has done is gained the ability to try to control that power, but whether or not even she can be successful all the time is a question for each individual game's needs to answer.