My thoughts on the vote options;
I like Frenzied Attainment a fair bit. It's quite cost-effective for what it does, and it's benefits are generally pretty good. Mastery + 2x progression speed for a domain essentially lets us make something a discount Tris pick, or exalt one of our already chosen Tris picks to greater heights. The spell resistance/immunity is also fairly neat, basically putting up a 'you must be this swole to challenge us' barrier that grows with our own power. Of course, there is the issue that the resistance/immunity takes quite a long time to come online. Another House boon is neat, but nothing there quite grabs my eye. I'd probably go for either Ravenclaw or Slytherin, perfect memory is nice and we'd probably be able to leverage super potent blood somehow.
Hermetic Attainment just doesn't quite speak to me. The boost in magic power is nice, but not really enough to stand on it's own. Getting a Greatness in all Spells plus a nerfed Child Prodigy is a pretty good boost, not gonna lie. But it feels a bit too spread out to be of much use. Like, it lets us learn all things a bit faster/better, which is nice, and it stacks with all our areas of greatness, but I think I'd rather get a larger but specialized boost.
I think I like Sovereign Attainment the most out of these three, though. It's a relatively simple boost, but it's good enough to stand on it's own. It has the 2x progression that I like from Frenzied Attainment, and it gives us a fourth Tris slot which we can freely select. A few thoughts on what we could pick would be Charms (Which presumably still has a fair bit of synergy with our build, although that part may be covered by the Dark Arts), Rituals (As we're seeing with the current situation, the real big stuff for our build runs off rituals, so getting a boost there could be helpful in both the short and long term) or Patronus, to see what a Great Infinite Patronus looks like. And we also get Excelsior for a month in our new pick, I guess.
My thoughts on the next set are as follows;
I don't think I'll be going for Ecliptic. The benefits are just too nebulous for me to really feel passionate for it.
Unoculaic could be useful, I'll admit, but I just don't really like the thought of giving up an eye for power, even if it means we can get a cool magic prosthetic instead. I think I'll pass.
I really, really like Singularity. A 10x multiplier to Astronomy/Astrology research/action speed, with the possibility of further improvements down the road? And that's the weaker side of the boon? Aw yeah, sign me the heck up. And as others have said, the huge boost to magic power here can't be overstated.
Supernova is powerful, sure, and it'd be a lie to say that I wasn't tempted, but the waning of its power reduces my desire to pick it.
As such;
[X] Sovereign Attainment [50 Gnosis]
[X] Singularity Attainment [3 Gnosis]
Admittedly, if the unpurchased 50-Gnosis Attainments were guaranteed to stick around for us to pick up later, I'd probably go with Frenzied. But I don't want to risk losing this chance to pick up another Tris slot.
Although speaking of Frenzied, I'd much prefer that it's boost be applied to Astrology, so as to combo with Singularity's insane boost to progression.