Why not create a tesla coil from ic2 then? Just beware of friendly fire though. And i think MFFS is created for protection, not for killing so i believe weapons are not necessary for this mod.
I'm with you one opinion ..Defense YES Killing only NO
 QuoteThe mob defense upgrade does not kill custom enemy mobs like the thaumcraft slime.
not my fault  
  if they are not descended from one of the base class like EntityMob or EntitySlime