cometaryorbit

Well the "density doesn't change" thing is a bit weird. Technically density does change if mass does, since density is just mass divided by volume. When the characters in the books (and that annotation) talk about density not changing, they mean that the body doesn't become more resilient or resistant to being punctured as you'd expect a more dense object to. Which I think would have its own weird physics implications because of "Newton's impact depth approximation" [ https://en.wikipedia.org/wiki/Impact_depth ] - density itself, not just structural strength, affects how deep a high-speed projectile goes into a target, since there is more mass to be pushed out of the way (transfer momentum to). EDIT: Flight would be hard (astronauts in the space station can't really fly/swim through air well), and artificial wings or some such would be too heavy. (Assuming Wax's volume is about 0.1 cubic meters, which is likely high, to be neutrally buoyant in air he would have to weigh about 120 grams. Even clothes would weigh him down.)

I think there's more Investiture in a human (and thus in a Breath) than I used to assume. On Scadrial, we see that metalminds (small ones anyway) are Pushable; but it's considered impossible to Push/Pull metals piercing a human body. So there's more, probably significantly more, Investiture in a human than a small metalmind; and from the "how hard is it to Push on various things" WoB* we know a metalmind ("middle of the realm") is more Invested than a Hemalurgic spike ("at the bottom") or a soulstamped object ("one of the lower, easier things"). * Question 3 on http://www.theoryland.com/intvsresults.php?kwt='drabs' But still... the God King with 50,000 Breaths plus a Divine Breath would be way more Invested than Nightblood. So Nightblood must retain part of the investiture he eats (yeah, black smoke, but that's probably like excreting waste - some part still gets used/stored).

WOR Ch. 42 Epigraph: And how, exactly, was Ishi going to do that? According to Syl, Honorblade Surgebinding is less efficient than normal. Taln displays more-than-human reflexes/speed, but Stormlight boosts your physical capability too. The Heralds must have had some really impressive powers unrelated to Surgebinding... with just the Bondsmith Honorblade (and the Bondsmiths probably aren't a primary battle Order) and super-reflexes, Ishi would have had trouble beating a single "battle Order" KR, much less all of them.

Allomancy is a Spiritual DNA/Preservation Investiture thing, so he should keep that even if he got a new body rather than regenerating his old one. (He couldn't use it as a Cognitive Shadow, but that's probably because he couldn't metabolize the metal or even really contact it Physically.) He apparently used Hemalurgy to come back to life, but I don't know if the spike just "staples" his soul/Shadow to his body or if it actually grants a power. It seems from the ending of BOM that he got Feruchemy somehow, though...

I don't think the Dawnshards were 'shards' in the sense of Shardblade/Shardplate, because just about the only things we know about them are that: -Dalinar's visions say they are missing and that's a big problem; - they were said to "bind any creature voidish or mortal" (WOK ch 36 epigraph). Of course, the same epigraph refers to "the steps crafted for Heralds, ten strides tall apiece," so who knows how reliable it is - Heralds appear to be normal human size. If they were just Shards made from a different kind of spren, I don't know why their lack would be such a big deal - there are quite a few Shardblades/plate still around. And if their function is to "bind" that really doesn't sound like a weapon or armor. I'm wondering if they were involved in the mysterious Bondsmith alternate plan to deal with the Voidbringers.