Best place IMO to farm eternal fire is in Borean Tundra/Sholazar Basin route…

This is what you need to do…

Take Engineering and Mining – Get a Zapthrottal Mote Extractor and look for Steam Clouds.. they can drop upto 5 crystalise fire and drop crystalise water also… while you are on you flying about mine all the cobolst you see, also look out for the rare mob the can be in that area… (blue L70 chest piece and the goodie bag).

When you have completed a lap of the steam pits fly over to the elemenatl little area near the cost… farm all the fire mobs there… then do a quick lap of Sholazar… that will net you more steam clouds, saronite, titanium and random assorted other goodies… also install a rare mob alart… each full routine withh net you about 800g in goods and doing the larger route will aloow the steam cloauds to respawn…