Roll for intelligence… 16. The progress of the one hit BEG killing spell is 33%
<many turns later>
Roll for intelligence… 3. The progress of the one hit BEG killing spell is 96%. That’s the only action you can take on your turn. You better hope the party can stop the army from hitting the power source of this spell before it finishes.
Roll for intelligence… 5. Since that would be more than 100 the progress of the spell rolls back to 91%.
It’s like how the earth bulges out at the equator.
The momentum pulls them out, gravity pulls it back. Similar thing at the solar and galactic planes.
They “bulge” relatively to the spin of the material over time and the clumps of material then forms planets along that general plane.
From the aboves video you can see this at 44seconds
https://www.youtube.com/watch?v=sCkhEu3lYNc&t=44s
And a relevant PBS Spacetime video
Why is the Earth Round and the Milky Way Flat? | Space Time | PBS Digital Studios
But the biggest reason is the way gasses form in space. As noted in the above video at the 8:45 mark. Gasses aren’t able to fall back into the center along their axis of spin because of their momentum. But the gassed above and below the plane can move towards the gathering material there by gravity and so it flattens out.
https://youtu.be/Aj6Kc1mvsdo?t=8m45s