Nitpicking

They don't. Why do you assume T. is overthrown or destroyed? SPOILERS for the greater Cosmere:

I don't have Wind and Truth with me here, but didn't Retribution say he was going to inhale all the spren? Would that not include the Voidspren? The Voidspren were saved from being incorporated into Retribution as nothing but a source of Investiture by the Heralds and the Wind. And potentially, partly by the human and Singer freeing of Ba-Ado-Mishram. How will that affect their attitude in the Back Five?

We know that Enlightened Radiants (like Venli) can use Voidlight for the Surges. I expect they can also use Warlight.

I'm trying to avoid spoiling by implication, so I'll spoiler-hide the title:

I would argue that Dalinar's death is a fakeout, too. He's dead, but then the Blackthorn spren is young Dalinar. It's a cheat. I'm sure Brandon will use it to explore the Cognitive Shadow concept. Is that really Vasher, or a spren with Vasher's memories? Also, don't forget both Tanavast and Honor, who we were led to believe were dead. EDIT: SPOILER FOR A SECRET PROJECT

I would think microkinesis, but we only know a very few practitioners of that Invested Art.

I wonder how specific an "ability" is, that you can spike out of someone. If you formulate your Intent perfectly, can you spike out the ability to reject organs, thus making transplants incredibly easy? You could just let the spike "decay" and lose the ability to give that ability to someone else, nobody wants to be able to reject organs, it's an unwanted side effect of the ability to fight off infections.

The bit Jult highlighted is: " He will have to abide by those terms, as they are part of the promise Rayse made by taking up the Shard of Odium." One thing we know all the Shards are bound by: if they take an oath, violating it opens them up to being destroyed (splintered, the Vessel killed). Odium (who is pretty honest before Taravangian takes over) told Dalinar this, that if he broke an oath Cultivation could just kill him (in revenge for the killing of Tanavast).

Towerlight is said at the end of WaT to be available, but only in and very near Urithuru, and it can't be stored in gems because it leaks out quickly for plot convenience reasons. It's implied that only Radiants bound to Enlightened spren or Voidspren can use Voidlight. Venli comments that she can use Voidlight for Surges "because" she also has a Voidspren. (She also keeps her Envoyform abilities, such as speaking and understanding all languages.)

Wait, why did I spoiler that? This is a spoilers-allowed zone. Well, in Elantris, we see Raoden doing exactly that after what, a few months of practice? And the other Elantrians mostly have far less. So the answer is: why would a story about magic writing on an alien planet be realistic? In Tress we have two people who are both thousands of years old, so they have even better reason to be able to do it.

The Radiant Honorspren might not be willing to get close to Lasting Integrity, considering how abusive the current junta there was. Being captured could have been very bad for them.

SPOILERS FOR ONE OF THE SECRET PROJECTS

Cosmere spoiler answer: The whole "Yoki-Hijo are special" thing is and always was a lie (or arguably just a misconception). They become special by what they do, but anyone could call spirits if they became good enough artists. Painter does it!

Exactly my reaction.

Who says Hoid is using the Dor? He has all that Investiture from the Dawnshard.

Agreeing with the above, but I enjoyed it more than the other posters. It's a caper story, going back to Final Empire roots. Brandon loves capers. The set piece fights were fun to read. Too packed with lore drops for my taste. Probably third best of the Special Projects, after Tress and Emberdark.

Radiants need Stormlight to Surgebind, but opening a Perpendicularity doesn't seem to be Surgebinding per se. Note that even with Stormlight ceasing to exist, Ishar could send the souls of the Heralds into the Spiritual Realm using some other source of Investiture.

For all of his defenders: Brandon himself is on record as saying the book could have used another editing pass, for which there simply was not time. (Paraphrase.) It isn't the worst book written. It isn't even the worst Brandon Sanderson book. It's just (for me and some others) the weakest book in the Stormlight Archive. And as a student of stories (e. g. a person who reads lots of stories), I think it has to be. "Middle book syndrome" is a well-known problem for trilogies, so "book five of a decology" is part of the issue for WaT: it's the end of Part One of the SA, so it has to have a conclusion, but also it's the middle of the SA, so Our Heroes have to still be in deep trouble for it to be a story.

I suspect only Ishar after the death of Tanavast and the breaking of the Oathpact could do that. Remember, the Stormfather kept being surpised by what Ishar could do in his conflict with Dalinar--the Oathpact and Honor had limited him for thousands of years.

Koloss (Era 1) are only easy to replace if you have an unlimited supply of humans to put the spikes in. Also, hemalurgy is hard, you have to place each spike precisely, twice, IIRC (once in a victim to charge it, once in a second victim to use it).

An aluminum box prevents most Invested detection, e. g. SPOILERS FOR THE STORMLIGHT ARCHIVE

That's why I wrote that the Shard forces him.

I wonder if Brandon has seen the Pulse movies, in which red tape can trap or exclude ghosts.

Crackpot theory of the week: Discord will come in the Space Age, as Sazed loses control of Harmony. It's Hoid. Hoid is the Vessel. Who has brought more discord to the Cosmere than our provocateur? Hoid resists, but the dishard forces him, just to make it worse.

Point taken.