But then, I would think Electricity Resistance would work against that. As a DM, I wouldn't feel comfortable with it, and as a player, I'd probably balk at that being the explanation. Just a general "it's magic," I'd have no problem with, but passing it off as nonmagical, yet not as a poison, disease, etc. I can't feel comfy with.
MMM.. perhaps a microscopic parasitic organism that causes the fort save? It infests the muscles, and causes an almost instantaneous paralysis?
