Board Thread:Off Topic/@comment-25396609-20151125184514/@comment-27275832-20151128224838

I have a character that has magnetized spikes they shoot. They're held on with an EM, then, when he wants to fire them, he presses a button that makes it reverse polarity, sending the spike down a barrel.

EM's  are what they (used to) use in Particle accelerators (I think). those things get almost to the speed of light.