Are all magics on Sel their own individual systems, or are they different manifestations of the same system?
They are different manifestations of the same system.
Are all magics on Sel influenced by both Devotion and Dominion?
Yes.
In hemalurgy, does the person doing the spiking need to have Scadrian investiture?
No.
So, anyone with the knowledge could spike someone?
Yes.
hemalurgy
You said previously that a slider’s bubble is anchored to its position on Scadrial rather than on the slider’s position or on the train (if the burner was on a train). If the slider was on a rock in space, would the bubble be anchored to a position relative to Scadrial, the rock or something else?
RAFO.
A slider and a pulser are standing near each other and each put up a bubble. Neither is standing close enough to the other to be within the other’s bubble, but they are near enough that their bubbles would overlap what effect would you have?
The bubbles would overlap and it would be like a Venn diagram (i.e., outside both bubbles-normal time, in sliders bubble-fast time, in pulser’s bubble-slow time, in the overlap-normal time).
If a time bubble is raised in a vacuum, is the diameter larger than a bubble raised in atmosphere?
No, atmosphere has no effect on bubble diameter.
If a Scadrian allomancer had a baby with a Nalthian (and the baby was born on Nalthis), could the baby have an original Breath and also be a Natural allomancer?
It could happen, the baby would have a bit of Preservation and a bit of Endowment.
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