Elemental mellee mods

I know what the mods do, they add a certain type of elemental damage instead of slashing, blunt, etc., but which enemies are weak against earth and lightening elemental attacks?
I can't really seem to figure it out. I'm assuming the enemies in the Shiverpeaks are weak against Fire, and the enemies in Elona and Perdition Rock are weak against cold, but then again, I have never test it.

I'd say the earth enemies (those rock elementals, ...) in the desert are more succeptible to lightning dmg. But it all depends on the foes you'll be confronted with in the specific region where you are.


And also found this on Guildwiki:

http://gw.gamewikis.org/wiki/Earth_damage

http://gw.gamewikis.org/wiki/Fire_damage

http://gw.gamewikis.org/wiki/Lightning_damage

http://gw.gamewikis.org/wiki/Cold_damage

It seems that Tengus are weak against lighting. Probably Stone Summit dwarfs too.