I play in the mindset of Pokemon, so my brain translates metal into steel and it tells me to use fire on it. However on the spider things I find electric is more effective.
well killing them isnt that hard except your 2h or so... sneaker - easy anyway, master just run away theyre slow, melee - constant shield bash to stagger them...the combat difficulty is not scaled well - you can stagger most enemies so they can't hit you, but when they hit you 1 time your dead...needs improvement
anyway, fire on steel...doesnt make sense??? dont you think steel will be heated very high during the construction....electricity would make sense in terms of destroying their dwemer core, ice would make sense to slow em down...