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Waaaait, so there's been a Singer on Scadrial?

That is true, the Thrill Effect of Nergaoul and the physical transformation effect of Yelig-nar are entirely distinct. As @Calderis was saying, the Thrill is a purely mental/emotional effect (glowing eyes aside). Yelig-Nar required a Gem to be swallowed (by all indications to become a pseudo-gemheart) and then causes major physical modifications (crystals replacing internal organs) and grants all ten surges; which really sounds to me like an example of an extremely OP Form of Power to me, one so awesome it can overpower the physical form of even a human so long as it has a Gem seed to inhabit in the physical Realm even if it's not a natural/biological gemheart. But needing that physical anchor rather than Bonding and Blending their Spiritwebs directly in the Nahel Bond symbiosis.

I agree, I think Nergaoul is performing the same general AOE effect that Rioters have. I would say he doesnt seem capable of inspiring the full spectrum of emotions that a Rioter can, but being one of the three Mindless Unmade might mean he simply doesnt have enough agency and/or subtly to consciously change the tone of his effect. On a similar note, the Heart of the Revel seems to me to be the other side of the Neragaoul coin, being a Soother equivalent. Heart of the Revel drags down their emotions on a similar scope, but it's more antagonistic to the target than Soothing typically is.

Ah, gotcha, thanks. I think those are solid evidence that they were being affected by some kind of Corrupted Investiture (which Odium's mostly qualifies as), but since none of them actually performed any Surge-like actions, I really dont think we can call it Voidbinding. I mean, the actual effect on them was less than the base effects of holding Stormlight, and seemed a lot closer to simply being affected by a very strong Rioter.

There are a lot of different Bonds we've seen of various levels. The Nahel Bond, the Gemheart Form-bond, the bond between man and shard (blade or plate), the Honrblade Bond, the Oathpact (ie why the other heralds felt Vyre's attack), etc. In the case of the Thrill at Thaylen Fields, we saw that happen on the Shadesmar side, where Nergaoul disappeared from shadesmar ("drawn by the enemy along ancient paths" according to the Oathgate spren) and then we saw the flames of the soldiers turning red. This is definately a Bond, a Connection, but I dont think it has much in common with the Nahel Bond, relatively speaking. It's too temporary, seems one-directional, and appears to require a lot more physical proximity than a Spiritual Realm Bond like the Nahel Bond. Im sorry, I cant seem to parse out this post. You were posting quotes of yourself but I cant figure out the point you were trying to make with them?

Same. I think "Motivation" might be a more accurate term.

Sooo, he decided later in that same sighing that they would not, in fact, still be able to hold stormlight. He decided that they'd go a sort of dun-grey rather than bleeding out to a clear diamond-type or anything: For what it's worth, the line about it going grey rather than White or Clear makes me suspect that a 10th Heightening person might be able to drain them to full White/Clear the way they can drain the Grey that lesser Awakeners do not.

That's the trick. If it's a metal-platter style hard drive, I dont think he'd be able to perceive the information at all, any more than he could read those metal plates (Im remembering that correctly, yes?). And to manipulate it he'd need to futz with the non-metal components of the computer, but there are enough plastic bits in the drive motors and fans and whatnot to do some damage. But I picture it being more along the lines of arranging for a troublesome metal plate to be slagged in an "accidental" fire, rather than being able to tweak it's patterns/information directly. That could work. Though doing it in ral-time like that it might be easier for him to just manipulation the reader's perception rather than the physical glow of the glass, along the lines of how he manipulates the coppermind memories while they are in the person.

Chemically speaking they are still just carbon, no more metal than charcoal or diamond, so they would defiantly be a solid option for strong un-Pushable materials. Lots of resin composites would qualify as well.

I think there's a fundamental misinterpretation of F-Electrum here, and it's one that I was under for a very long time. Unlike other fictions (Runelords, Green Lantern, etc) Determination does not equal Willpower in this case. Tapping F-Electrum does not make you super-determined or more focused or committed or anything like that. It's a Bi-Polar Disorder Slider-bar: Storing it makes you depressed, while tapping it sends you into a manic state. Extreme tapping, let alone compounding, is not going to be particularly beneficial in most circumstances. That being said, Ive seen theories that Tapping Identity would increase one's metaphyscial mass in more or less the way described, making you less susceptible to outside manipulation, but that's all RAFO territory for now.

Solid State drives are definitely a lot of semiconductors, though the older HDD's were metal platters so he might not be able to futz with those. On the other hand, if he's clever enough he could probably manipulate it enough to corrupt the drive whole, if not actually modify the sectors selectively.

You can Push/Pull any un-Invested metal that is not Aluminum. So you cant push Atium or Shardblades, Aluminum, or any Metalmind or Hemalurgic spikes.

The first that comes to mind is Mortal Population. For reasons even the Spren do not understand, the Mandra's cannot survive long away form mortal population centers, and as a more general statement Mortals are one of the main food sources for lesser spren, particularly emotional spren (which Syl calls Passions). I couldnt say what the actual mechanism is, but I think it's significant that the Oathgates are all located in those large cites, specifically the large fractal cities. Which is another common trait that might indicate a construction constraint. Perhaps the Oathgates need to be supported by whatever it was that made these cities form as unique fractal shapes, and my money is giant Earth-Spren (Ground-spren? Roshar-spren?) that are cousins of the Cryptics and The Sibling. As to the OP, I have a general theory Ive been nursing recently that would apply, if at all correct. I have begun to think that all the best and most complex Fabrials of the Radiant Era were not actually crafted physical objects the way Navani understands them. The current understanding of a Fabral is to build a physical device that manipulates Stormlight in known ways, and then trap a naturally occurring spren that is somehow sympathetic and/or resonant with the intended function and/or purpose. I suspect that the best Artifabrians of the Radiant era instead used Soulcasting directly on the objects Spren to convince it to become a given Fabrial to it's core. So rather than building a device and then trapping a spren inside to power it, they would use soulcasting to directly reconfigure the Spirit/Spren of the object into a Fabrial. Which would mean that Oathgate-Spren are literally that, something as unique ans specific, whose Self-Identity is as specific as any Ship or Castle bead. Whether they started with Sapient Spren or they Soulcast an Object with enough Investiture to ascent an Object-spren to full sapience, I have no idea.

Agreed, I could get behind that as a use of Breaths, simply of the more common type of cosmere healing with those same limitations.

I guess my main point is that there are a ton of qualitative differences between a Diving Breath and simply having the 5th heightening from normal Breaths. Having a Divine Breath mimics all the benefits of holding ~5000 Breaths, sure, but I dont think it goes the other way. I believe there are enough examples of things that the Divine Breath can do that Breaths will not. Combined with the WOB that Divine Breath Healing would be narratively unbalancing if it didnt require full self-sacrifice, and I strongly believe we will not see ordinary Breaths perform such a feat.

I dont think so, for a couple reasons. For one, the Healing capability of divine breath is pretty specific, to the point where Returned have tried and failed to use their Deathwish miracle for something other than healing and failed. And from a Doylistic perspective, Brandon has said the way that "supercharged" healing doesnt violate his own Laws of writing about having limitations on magic is that it can only be done Once, then you die. Given that is the specific narrative limitation on the healing effect, I dont anticipate him making it so easy to mimic with the 5th Heightening alone.

They were expected to both eat and Boink in that room, I dont think basic hand-washing would be denied them.

She used a random board and charcoal, not chalk. Those she'd most likely be able to scrounge from the room itself; certainly charcoal from the fire, she was expected to burn the sheets. For what it's worth, she also "had pilfered a cup, then had hidden it in the room." to listen through the wall where guards were spying on their consummations.

Not 100% sure it would hold them (depending on what sort of realmic travel they are capable of once they abandon their host) but one solution would be to Soulcast the air around them into a block of Aluminum. This should be able to hold most things, including a Fused and potentially an Unmade You might need to lure the Unmade into a Gem first, but it wouldnt have to be Perfect.

On the topic of killing the Fused directly: We know that a shardblade wound wont kill/end a Fused, but we also know as a general statement that the Fused are very similar to natural spren. And we have seen a Shardblade kill a Spren when it was attacked directly. That last makes me wonder if there is a way to kill a fused with a Shardblade if you have the right circumstances. Perhaps, like Hemalurgy, you might be able to attack them directly if you access their CR form, if perhaps it is distinct from attacking one that has traveled to the CR with a Singer host? Just spit-balling....

At one point in OB Dalinar mentioned that the Sunmaker used a lot of excuses that largely amounted to a sense of cultural superiority. Dalinar wondered if anyone bought those excuses even at the time. That being said, those would have been the public reasons, so that doesnt preclude the Sunmaker having secret motivations involving visions or some other secret knowledge. I doubt it, personally, but it could be.

As I understand it Brandon has made slightly conflicting statements about whether the Lord Ruler was actually spiked or not, so I dont think we can say for sure. We know that at least some of the things that people thought were spikes were in fact metalminds that he hid in himself to prevent anyone from Pushing/Pulling them, and from realizing he was using Feruchemy. Aside from that, I'd lean toward the idea that he would have almost inevitably gone at least a tad crazy over the centuries, on top of the possibility that having his Spiritweb "stretched" by becoming a Sliver (expanded and deflated) might have opened him up to Ruin in a similar fashion.

Some relevant WOB's:

Ten is actually cosmere significant to the Rosharan planetary system specifically, which includes Roshar, Ashyn, and Braize (and other gas giants). The whole system is 10-centric, with Braize being uniquely nine-centric for reasons unknown (WOB has RAFO'd it so far). He's said the number of Surges and/or magic systems really more depends on how you want to count them. So far there are Ten Radiant Surges, but the different Orders that share a surge dont always manifest them the same ways. Voidbinding seems to offer alternate versions of a Surge (so far we've only seen Renarin's Future-sight Lightweaving). And then there are fabrials, where each can use a single Surge but with the capability to customize and modify them via technological configuration. There is a very strong argument by @Calderis that the Fused were built to be Living Fabrials to access their surges, with the noticeable differences from Radiant surges being due to using Voidlight rather than Stormlight as their fuel. Cant find the link at the moment, sorry, but it's worth the read.

Alternatively, it could be mercury which by virtue of its liquid state is entirely resistant to anything I would call permanent physical damage.