Where it goes from here: If the enemy actually wants to defeat this coalition, nothing happens. This is a temporary alliance against an outside threat, and if said threat goes away, the alliance will probably collapse of its own accord. (It may bring some lasting changes to the leadership of Hogwarts, but people will chafe against the strict security, and old and new grudges will emerge, and the coalition will break.)

If the enemy has been breeding Harry/Draco as the future leader of Magical Britain (much more likely), they will continue to attack or otherwise be active, probably conceding many victories to the new Kids' Coalition.

It reads like a very forced solution - there would be significant gains to one noble house going against the tradition, so their heir could have several years of Hogwarts students rally behind them - and also kind of impossible to implement, given that we don't know much about their birth control methods, and the Noble Houses are unlikely to all marry at the same time etc.

That said, the HP universe which Eliezer took on as his setting is full of such bugs, and this is a reasonable patch.

I think that people may be confused as to what's happening with this announcement.

The early phase details of the agreement were negotiated first between Harry and Lucius. Harry represented house Potter here because he's the entirety of house Potter. Lucius negotiated with Harry because Harry (as the boy who lived) has a lot of clout and credibility and he offered to throw that behind Draco. On an emotional level, HP also offers revenge against whoever attacked Draco and the possibility of revenge against Dumbledore.

Step two, the adults negotiate amongst themselves. In this second phase Lucius goes to the board of Governors with the agreement he and Harry made as a starting point.

The Knott and Greengrass votes are naturally inclined to go with Malfoy by faction alliance. Knott is also incentivized to go with the plan for other reasons. His son is a friend and chief lieutenant of Harry Potter. That's a potentially very valuable connection, but its a connection that can't be used when the votes are split death eater v Dumbledore. Realignment effectively "monetized" that asset. Greengrass doesn't have that and so asks for a few sweeteners on its deal. Also, the plan reduce... (read more)

I've felt like the whole story is too fast, but there are apparently reasons EY wanted to cram the story into a single year. To have only one defense professor? To avoid having to deal with Harry's sex life? I'm not quite sure what all the reasons are (I imagine they're multiple, and that some have probably been mentioned by EY and I'm forgetting), but while I think I would have preferred having Harry develop over 7 years as in canon instead of solving everything as an 11 year old, it's obvious that as the story is actually set up some things just are going to have to happen implausibly quickly.

I wonder if this will somehow play into Quirrell's plot to have both Ravenclaw and Slytherin win the house cup.

Even ignoring the rest of the post, the idea of a Green Slytherin based off of Avada Kedavra is interesting for many reasons.

Let's look at some of the implications:

• Avada Kedavra and the Patronus Charm (2.0) are basically mutually exclusive. In order to cast the first, you must want someone dead for the sake of being dead, and in order to cast the latter you must value all life to the point of denying death altogether.

• Avada Kedavra and the Patronus Charm (2.0) cancel each other out. We saw this in Azkaban, and at the time we probably assumed it was just a result of Quirrell and Harry's magic going out of control, but on closer inspection it seems that both simply destroy the other, matter and antimatter style, which makes sense considering what type of magic they are created from. A magically created preference for death over life, and a magically created preference for life over death.

• They both also follow the political lines, as you mention above. Avada Kedavra is more likely to be known and cast by those desperate for someone to hate, and the True Patronus is more likely to be cast by those who are trying to cooperate, simply because those mindsets are more likely to lead

My guess is computer hardware and a source of electricity, so he can finally get started on one of those big projects to gain large amounts of personal power / resources.

The economy-disrupting arbitrage scheme was introduced as early as chapter 4. Lots of money would have helped Harry in pretty much every arc. He could think of many, many other schemes to help him finally start world optimisation in earnest. But he never did that. In story logic, he never got round to doing it due to interference from all sides. In writing logic, this can only happen in the final arc because otherwise, the story will be known as "Harry Potter gets really rich" and cease to be about the methods of rationality anymore.

That doesn't necessarily point to computer hardware, but chapter 87 mentions them as a powerful tool that wizards lack ("If there's a money-making method in this book that sounds difficult for a wizard, but it's easy if we can use Dad's old Mac Plus, then we'd have a plan.") and I have a hard time thinking about world optimisation plans that wouldn't benefit from at least some sensible organisation of data, scheduling and on-the-fly printing.

Most of the ideas listed so far are either much too nasty, better done with magic, or both. Mostly both. So, what contingencies could Harry procure from the world for a reasonably modest amount of money that do things he cannot just transfigure, or do by wand, and which the twins would not recognize?

First thing that comes to mind are various non-lethal drugs, since those are going into the targets body, which means transfiguration is out if you want the subject to live. So, LSD (lethal dose absurdly higher than effective dose. .which is useful if you want to dose a crowd) Tranquilizers think this fits on all counts?

Lets see, what else would it be a bad idea/impractical to transfigure. Muggle photography gear? But the twins would recognize that.

Smoke grenades. (Not subject to finite, a counter for every spell that requires you to see your target.)

Protective kit good enough to count as valid precautions for transfiguration stunts.. would break the budget given.

Id say bugging kit, but a purely mechanical recording device would be a museum piece, and cabinet size..

1) A nuclear device

You can't buy nuclear or other WMDs for a hundred Galleons. And the instruction implied buying, not to stealing (and what wizard capable of stealing nuclear warheads would want or need such a paltry payment?)

More to the point, Harry - or any wizard - can just Transfigure WMDs. Quick, free, and no need to carry dangerous stuff around.

He can also Transfigure antimatter. If he can come up with a reliable remote trigger, that is gram per gram the deadliest thing known to Muggle science. It was also foreshadowed a bit (chapter 14):

Say, Professor McGonagall, did you know that time-reversed ordinary matter looks just like antimatter? Why yes it does! Did you know that one kilogram of antimatter encountering one kilogram of matter will annihilate in an explosion equivalent to 43 million tons of TNT? Do you realise that I myself weigh 41 kilograms and that the resulting blast would leave A GIANT SMOKING CRATER WHERE THERE USED TO BE SCOTLAND?

2) Some other form of muggle weapon

As above for any weapon I can think of. Antimatter and nuclear weapons trump any area-effect attack. Poisons and biological or chemical agents can be Transfigured too, unless you need them to... (read more)