I learned about this spot in Wintergrasp from the comments on Wowhead.  I have done very limited testing personally.  I have yet to get a good solid hour of testing in, which would be what I’d need before giving it a final thumbs-up.  I’m hoping that someone here might chime in with their test results.

I’ve been looking around for the best place to farm those, and I’ve found it. You will find “Flame Revenant” and “Raging Flame” at 83.71 in Wintergrasp.

To the bad part, you will only be able to farm this when your faction controls Wintergrasp. I’m not really sure if it’s a bad part though. When you farm there, you are sure that noone from the opposite faction are going to interrupt your farming by killing your mobs. Because the Flame Revenants, which has 100% chance to drop 1-3 crystallized fires (motes), can only be seen by the faction who controls Wintergrasp.

Okay, to some quick facts about this place :

Raging flame
*Has an approx. droprate of 25% on the crystallizers, 1-2 each drop.
*No special abilities
*Hits me as a cloth mage for 550~ firedamage per hit.
*Immune to fire spell damage, extra vulnerable to frost damage.
*12600 health, easy kills. Alot of them around the area.

Flame Revenant
*100% droprate on the crystallizers, 1-3 each drop
*4 spawns, 5 minute timer on the spawns. Giving around half an eternal each 5 minutes.
*Same as for Raging Flame, no special abilities.
*Actually not immune to fire spell damage.
*25200 health, average in difficulty. Melees could use bandages while farming these, since they hit fairly hard, dealing 1200 critical hits on me as cloth.

I farmed for one hour, while beeing alone there, to test how many eternals per hour you can get.

The result :

First 15 minutes – 2.1 Eternals
The next 15 minutes – 2.3 Eternals
~~ – 2.8 Eternals
~~ – 2.1 Eternals

With this said, I had 9.3 eternals within one hour as a Frost mage with green/blue level 80 gear.

A couple of observations from the short time I have been able to test:

1.  It’s definitely true that you cannot see the Revenants if your faction doesn’t control Wintergrasp.  You can still farm the other little guys, though.

2.  They drop some pretty nice gray items: 3g for gray weapons, and they all drop gray crystals that stack to over 3g very quickly.

3.  Remember: it is a PVP zone.  You’re flagged while you’re there.  If you’re not used to pee vee pee, be alert to opposing faction members coming to bother you, which could ruin your farming there.

UPDATE:  After some brief tests, I can definitely conclude that it is NOT worth farming if your faction doesn’t control the zone.  The little elementals don’t drop enough to make it worth it.  I’m still testing whether or not farming there will be worthwhile once we control it.

A couple of points:  I made about 2-300g per hour farming just the small elementals, between Crystallized and Eternal Fire, and the grays they drop.  So, if you can’t find a way to farm gold faster than that (like you have terrible crafting professions and don’t ‘play’ the Auction House), you can try it.  It seems kinda ‘meh’ to me.  The other problem is that: 1) you have to have the place to yourself…it’s a very small area, and hard to get alone there, and 2) if you ARE alone and a member of another faction comes, it interrupts your farming and makes your gold per hour rate go way down.

UPDATE #2:  With my faction in control of Wintergrasp, I decided to farm some Crystallized Fire.  After about 30 minutes of uninterrupted farming, I had about 200g worth of stuff (between grays and Crystallized Fire).  Sadly, though, about 50g of that was from mining the nodes that were right there.  So if you don’t have mining, it would be a little less.  My conclusion is that this is NOT a good spot for farming gold.  Especially with the chance of being interrupted to do a little PVP while trying to farm.  (The spot is so small, it is really rare to have it yourself.)

Some people might say, “well, at least I can farm the Eternal Fires I need and save me some gold!”  They should read the ‘Myths’ section on this site.  If you can find a faster way to make gold than 400g per hour, do that, and BUY the Eternal Fires you need.