Do you think Alcor has put up any sort of protection, like the unicorn spell, around Mizar or the Mystery Shack? Something Mizar can activate if Alcor can’t come but they might be in danger?

Probably more the Mystery Shack rather than Mizar. And even then for the Mystery Shack, it’s more while ze’s growing up and learning how to take care of themselves. Once ze is able to start eating and burping out the bones of intruders, Dipper figures ze is going to be fine.

Necromancery Anon here! Two things: What is the greatest hypothetical size of the Mystery Shack once it starts to grow sentient and grow larger, and something slightly more crackish, if some of the core rules of the universe are that the house never loses, and neither does Mabel, what happens when Mabel plays against the house?

1. Mod S imagines that outwardly, the Shack doesn’t change overmuch size wise, outside of gaining an extra back room and a room tacked onto the roof completely in the face of any and all building codes. 

Inside  on the other hand well… If the Shack likes you, you only get lost sometimes. If you try and hurt the people inside, the Shack will swallow you whole

(it big)

2. Look, I for one don’t want the universe to implode and neither does the universe, so we just keep Mabel away from games of chance with cosmic entities.

The Magic School Shack

So lots of kids live in the Wandering Shack, and are presumably educated there too since ze’s always moving around, and so the kids can’t go to a regular school because those are stationary. Thus, I headcanon that some children brought in by the Shack might stay and teach when they grow up. And everyone knows the best part of going to school are the field trips, and the teachers and the Shack doesn’t want the kids to miss out on such a fun thing because they don’t go to “normal” school, so where might they take them?

The science teacher, a redheaded curly-haired r!Mabel, usually has the zaniest ideas. Their suggestion to visit the inside of an active volcano wasn’t even the most memorable, and it erupted glitter that day. Not even Alcor knows how they got THAT to happen, and he was THERE. The class agreed that it was all very educational, however.

So, there’s a slight discrepancy where the Mystery Shack/Library is said to be gone already in Reincarnation Blues, but in Toby and Maddie’s time, it’s still in Gravity Falls, maintained by Jerry. Now, I KNOW the TAU timeline should always be taken with a grain of salt, but I like to imagine that the Shack gets up and goes wandering for a while every so often, and then settles down in Gravity Falls again.

That’s exactly what happens!

HC that one of the other kids living in the Wandering Shack is a girl who likes to go around trying to fix the Shack up with an old, old toolbox (one that Dipper instantly recognizes) she found ‘just lying around’ back when she was a six and relatively new to the Shack.

It doesn’t take long for Alcor to notice that things around the Shack that shouldn’t be breaking—like the electrical wiring that hasn’t actually carried anything as boring as electricity since Mabel’s lifetime—are suddenly having small issues like braiding itself into giggling friendship bracelets or being nibbled on by rats made of living (non-flammable) fireworks. It’s never anything dangerous or even that inconvenient, and Dipper notices right away that the problems seem to go away almost immediately after little Reagan gets to work with her pre-Transcendence tools.

He never voices his observations, though… Why bother? The Shack knows Dipper’s glad to have their handyman back, too, even if Soos is a little shorter this time around.

Alcor doesn’t like it when parents try to ‘fix’ their special needs kids. But how would he react to a kid who is summoning him to make their only parent, who has like schizophreniaor something, normal so they can stay with them and not be taken from their custody?

Mod R doesn’t see him trying to ‘fix’ the parent to make them neurotypical. It would be a tricky situation at first, but I see him refusing the deal as the kid has described it. He’d make another deal with the kid to get their parent the resources needed to treat their schizophrenia (edit: if the parent themselves consented to it): meds, therapy and the like. If worst comes to worst and the parent proves themselves unfit to take care of the child, maybe Alcor even takes the child in himself (to the Wandering Shack or somesuch), but has the two in regular contact, still a family.

Edit: As an aside, the terminology generally agreed upon nowadays is “neurotypical” for people without mental illnesses or disabilities, not “normal”, as that is generally agreed to be problematic. To all, I want to reiterate that, in regards to this kind of thing, trying to “fix someone to make them normal” is a very problematic idea and not a thing that Alcor will do, regardless of the circumstance. It belies ideas and doctrines that he is opposed to, and this has been said before on the blog.

Editedit: Another issue with this type of deal you’re suggesting is it’s another person wishing for the neurodiverse person to be “fixed”. The neurodiverse person doesn’t get agency or a choice or even an opinion on whether they want to have a big part of how they perceive the world erased. He would definitely not like that.