Other spells may work with a moving circle. However, the text of Aegis makes clear that it is a special kind of spell, not subject to change in it's parameters. And I have always played boundary as be distinctly tied to the ground.
If a spell could be reduced to structure (because it was more flexible) then applied to a moving structure, then it could protect a wagon. But I never thought of Aegis as that flexible.
Just my opinion. As long as whatever changes we apply to the Aegis are usable by everybody, I would be fine with it. It's just that I never thought of Aegis as a very flexible spell.

I just re-read the last paragraph of the explanation of the spell, on page 161 of ArM5. It would require a breakthrough to change the parameters of the spell. So, could it be changed to apply to a moving structure? Yes, with a breakthrough.
This message was last edited by the player at 02:16, Tue 23 Mar 2021.

Yes, I don't think anyone would argue against them having an aegis if they did a breakthrough to change the target.

But I don't think you should be able to do a moving boundary.

I'm fine with that. I honestly didn't think it would be worth it to cast Aegis on a wagon anyway. I was just wondering.

I went back to reread the spell. I don't feel it fits well with mobility. If a new version at T: Structure were invented, sure.

Meanwhile, I was imagining how AotH could end up supplanting PM if it Boundary can be an overly mobile thing. For example, someone uses a cloak for a boundary, so it protects anything within the cloak. There was a specific effort to divorce PM from ReVi, and this could totally undo it. So Boundary should really be a piece of ground or such.

That still leaves an issue of: What if I ReTe a covenant and all the land around it to scoop it up and fly elsewhere? I don't think that's too likely, though, so we'll figure that out if it ever happens when it happens.

In reply to Alpha SG (msg # 239):

Would you allow an Aegis Boundary to be defined by a Regio boundary?

It would have to be exceptionally small.

In reply to Player 15 (msg # 240):

I thought about this a little bit. I think there could be problems if AotH is cast from outside the Regio. But I don't see a problem with it being cast inside the Regio using the Regio border as the Boundary. The problem with casting from outside is that they don't really occupy the same space. It would be kind of like me saying I just ran around Australia last night because I ran in a circle and that circle goes around a cone passing through the earth and encompassing Australia, except that's at least physically mappable in three dimensions.

As for sizes, if covenants (or the inside of the Regio) are too big, this is an important note from my list of interpretations:

In reply to Alpha SG (msg # 243):

Yeah, I believe eventually the Aerie will need to research an Aegis with bigger size.

Just invent, no original research. If that's what you meant, pretty sure he let someone start with a size increased one.

Right. You can invent it without needing to do any original research. But if you want a Structure version or an Until version or similar (Aura would probably be fantastic for those who can do it), then you'll need to do original research.

Screw that I'm building a wall from the Black sea to the Baltic sea and putting an aegis around Europe. If you are curious what I'm doing walking the coast for 5 years...

In reply to Player 6 (msg # 244):

Yes, Apicem Domus (Hedge Relations cov) has a lab text for a +1 sized Aegis. Definitely suitable for our purposes. Might be smaller than you are hoping to make.

In reply to Salma ex Miscellanea (msg # 248):

Our covenant has a Vast Aura, so we'll need a few magnitudes to cover that entire area. And it would be great to raise multiple magical animals. Heck, with that size, we might eventually go looking for magical elephants... Think about having one such cute thing as a Familiar...

You do have to actually have a boundary set up. "Edge of the Aura" isn't necessarily a boundary if it stops in the middle of the desert.

In reply to Player 4 (msg # 250):

Setting up a boundary can be done. getting one's Lab totals to be high enough to be able to research the spell with the size modifiers is gonna take longer.

Invent.

The real problem is you have to trade off effect for size. If you end up Vim rich then you might consider having a weak one for the whole joint and a strong one that you keep on hand in case you actually piss someone off.

Like we could pretty easily pop your weak giant aegis like a soap bubble or just cast through it if a wiz war broke out. Or a big beasty takes exception to you stealing its young.

Not actually sure why you want it over huge empty fields or whatever tbh.

In reply to Player 6 (msg # 249):

The city of Garama itself is 10 hectares/25 acres. It is surrounded by a moat, that children swam in as late as 1937. So there is definitely enough water to water our flocks. And that is almost the exact size of boundary that would be covered by the +1 size that the Hedge Relations Covenant has.

The one we have could cover our tower and surrounding areas/ruins where we could build pens.
This message was last updated by the player at 19:49, Thu 25 Mar 2021.

In reply to Jaegar of Merinita (msg # 253):

1 hectare is almost 1/3 larger in area than a circle of 100 yards diameter.

Specifically

1 hectare is   10000m^2
10 hectare is 100000m^2
50*50*3*10=    75000m^2

I usually allow boundary to be a little more wiggly in size but he's not wrong. I'm also not acknowledging and difference between a pace/meter/yard and I never will.

In reply to Player 13 (msg # 254):

The increased size spell is 10x size, correct? I am probably off by some. 7.8 Hectares, and the walls are a weird shape, so would have to not include every street. 50 x 50 = 2,500 x3.14 = 7850 x 10 = 78,500. Math is definitely not my strong suit. If my calculations are off, please let me know.
This message was lightly edited by the player at 20:41, Thu 25 Mar 2021.

My idea, for the future, is this:

We have a covenant in a Vast Aura (about 5 miles diameter). As the menagerie expands, we'll want to house the animals within the Aura, especially for the Magical Animals, so that they can live well.

The main reason i want to extend the Aegis to where the animals live is because that is gonna be one of our main sources of income, research, and possible Vis source. Plus, it can become a site where other covenants send their Magi to look for a suitable Familiar.

To better protect this endeavor, I want to have the Aegis extend over it. Yes, I'm aware it might potentially make the Aegis' Penetration lower, but it will still be better than nothing.

If a normal Aegis is about 100 yards in diameter, which is about 150 square yards in area, and our Aura is about 5 mile diameter, that makes it around 13,800 square yards area. And if every Size magnitude is 10 times the area, with +2 Size magnitudes, we can have an area around 15,000 square yards, which should be enough to cover the entire Aura, so a minimum of Revi30, to offer the same protection as a Revi20 Aegis.

If need be, My magus will invest in that.

Logistics there are on you but the mechanics are sound. So in terms of this thread you are probably set.

Doing the technical math:

Boundary handles 7854 square paces (yards), which is about 0.6 hectares.

If the boundary to be used at Garama isn't that much bigger that 6 hectares, that should be fine. It may well not be the full 10 hectares, so we're probably within the wiggle room.

5 miles across is 60,821,234 square paces (yards). That's about 7744 times the base Boundary. Each +1 gets you x10 area. So you need +4. You can estimate this quickly with diameter as each x3 diameter roughly costs +1; you'll get to the same +4.

In reply to Alpha SG (msg # 259):

You're correct, I forgot to square the Radius in my earlier calculations, sorry.