I have a race of mountain giants (who stand roughly 10-15 feet tall) and have long worship the storms and more importantly the lightning that is cast from them. Long have they sought after a way to "create" lightning of their own.
Their current idea is a Amentum that a warrior would spin at great speed before releasing causing the javelin to discharge lightning at their foes as it flies into their ranks.
This question has two main parts: Is there any material that can build up enough static electricity through kinetic force to cause lethal damage to humans and secondly would muscle mass alone be enough to wield this weapon?
Note: The giants are pretty strong roughly 3 times the 'average' human and a Amentum can be wound up like a sling before release (which can break the sound barrier in the right hands) no clue if this information helps.