Quote from syndutrill >>

> Okey, so it's immoveable, but in which inertia system? 

exactly. why would you assume it's only relative to the planet's rotation and not it's orbit around the star, or the star's orbit around the galactic disc, or ... 

for example, earth rotates at about 600 miles per hour, orbits at around 6000 miles per hour, and moves through the galaxy at around 60000 mph.

imo, it needs to fixed to the inertial frame of the activator. so if you're riding on a dragon when it's activated, vs. standing in the same room as the dragon, it's going to give different results.

IMO, the rod, upon pushing the button, instantly fixates itself in place in 3 Dimensional space relative to the nearest, largest source of gravity. Therefor, the planet you're standing on would be that, and would lock itself to the planet in movement through the galaxy. There is no inertia involved, except that of the planet, in which you're already part of anyway.

If you were riding a dragon flying along inside the gravity-well of the planet, depending on where you pushed the button relative to yourself (above your head, in front of your stomach, etc), either your hand would instantly be destroyed or you and/or the dragon would practically instantly die from being sliced by the rod, because it instantly fixated itself in position relative to the planet and you and the dragon are moving very fast relative to the planet. Your body's inertia then, relative to the planet, would apply that force onto the rod, which is not going to move. It's like a seatbelt in a car if you have a head-on crash. You will be bruised in the shape of the seat belt. But if you're going 400 mph in that car crash, and the seat belt instantly stops you, your head very well may just rip itself from your spine. Yay physics!

Length of rod?

Imivabel shotgun glyph fireball to launch darts 24 darts in one turn