Drop: Foreboding Flame 
Zone: Timeless Isle
Approximate Drop Rate: unknown
90% Hit Chance
Blasts the enemy with fire, dealing 472 Elemental damage.
85% Hit Chance
Hurls a bolt of mystical fire at the enemy, dealing 551 Magic damage.
Increases your team's hit chance by 10% for 9 rounds.
100% Hit Chance
Scorches the ground, dealing 492 Dragonkin damage and dealing 78 Dragonkin damage to all active pets each round for 9 rounds.
During Scorched Earth, all pets count as Burning .
95% Hit Chance
Deals 591 Elemental damage.
Deals 197 Elemental additional damage if the target is Burning .
Adds 78.8 damage to every attack against the target and reduces the target's speed by 25%.
Lasts 4 rounds.
Elementals ignore all negative weather effects.
50% from Aquatic abilities
33% from Mechanical abilities
Quite lucky on this one, been farming for around an hour (I saw Jadefire Spirit spawning twice). I think Ive killed around 20 Forebonding Flame (I also went out to kill Houlon). Good luck everyone!
About an hour and a half of farming before I got mine, just doing sweeps of the cavern.
This pet FINALLY dropped for me today. Other than the first week where I spent it on the beach killing the dancers for their pet for the daily kill 20 elites quest,I have spent every daily in that cave killing the flames for their pet. I must have killed over a thousand of them (I often do way more than the needed 20, especially when I was waiting for Jadefire to spawn). What was weird though was I was with another guy farming them and we got 2 one after the other!
Taluka's advice is spot on. Would only add that the more buffs to have the better. Would try to stay with in reach of the blue fires so you can re-buff. I think I will be killing and dying a lot to get this pet.
Took 2 days for it to drop! But can't complain I got this pet and Jadefire within 10 min apart! Oh happy day!! :)
Farmed almost 2000 of these doing the 20 kill dailies on 4 characters before it finally dropped. Don't give up hope!
I started killing the forboding flames whenever I was in the cave--probably around 30 kills in all. I wasn't seriously farming them though. Last night around Kargath I had one drop from a forboding flame that pathed near the area rock moss spawns.
Sorry I can't give a more concise time-I was too excited to notice it but I think it'was between 9:30 and 10pm.
I had this drop after about 150-200 kills, I stopped counting, but it was two hours. It dropped 2 minutes before server restart and I was so excited I didn't realize my bags were full till I logged in after server restart. I was so upset.
luckily, I put in a ticket and got it back.... He's so cute! A great addition.
A strong addition to a conflag team.
So after 8 total Hours farming, 1 on another occasion, 5 straight and 2 after a break I finally saw this drop. I killed about 400 or so of them and really do think it was mostly due to the fact that no one had been in the cave killing when I got back there for the last round that it dropped.
Got one yesterday while my husband was showing me around the cavern. He let me NEED on it, cause he's awesome like that. I knew he really wanted one too, so I went out on another toon and realm (lower pop) to try my luck today. Got one on the first kill. Lower population realms may take more time to get the rares down (unless people are grouping), but great for pet hunting!
Got him after three days farming, so I don't really believe his drop rate is that low. I was never camping the cave since the isle had so many things to do, so what I usually did was: Pop all my isle items (Book, Brew and Crystal), get a debuff, kill all and leave to the beach. There I kill all Jadefire Dancers and go back to the cave, killing 2 Death Adders on the way. This usually gives me just the right time for the cave to respawn, so I did that circuit for a few hours easily.
Possible drop from the Foreboding Flame elites in the Cavern of Lost Spirits.
As mentioned, try to keep the damage reduction buff on you by clicking the blue fires throughout the cave. And when fighting them, be sure to interrupt their Spiritfire Bolt as often as you can, as it starts to really hurt if left unchecked.
The respawn on these adds isn't horribly slow, about 7-10min or so for each. But considering it takes only minutes to clear the cave with a group, it can leave you waiting for more, quite often. Especially if there are others farming.
There's only one breed, P/S. Not sure on the drop rate though. My bf got his within minutes and I got mine after about one hour of farming. But we've spent at least another 3 hours farming so far for my friends, with no luck.
Just got mine today, I found him in 10 mins of farming these. Good luck and happy hunting to anyone else who is looking for him!
just picked this pet up was pretty easy when farming these mobs make sure you click on the blue fires reduces fire damage by 50% gl happy hunting