Because of BC I had to skip a lot of old instance q's and some I manage to solo like this one.

Lv 70 destro lock. Don't think it was easy, caused me 1 wipe and I had to grind all of the keys again.

So if you still have this q after all of this BC questing and leveling and you better solo this q rather than going with an aggro < lv 70 party. Make sure to have all 12 keys first.

I recommend to read http://www.wowwiki.com/How_to_solo_Attunement up till Lord Incendius. Instead of jumping in the lava, just hug the rim of the place where Lord Incendius is making his pat circles and try not to aggro him. As a lv 70 you will not gain aggro through the next door with the 2 fire elementals.
You will step into the area where a lot of elementals are wandering + Fineous Darkvire.
Use an invisibility potion and run all the way up as close to the edge of the path as possible. When the potion is over you will be upstairs and face the plateau with a few mobs and a wandering fire elemental. Try to skip those and enter the first room to your left which is the hall to The Vault. You can enter it without pulling any aggro. There I summoned my voidwalker. You can clean this room easily as long as you're able to control any runners. They can pull more groups of mobs and that can be devastating.

When this room is cleared I made a soulstone, I guess if you're not a warlock try to get one on you before you do this run. In total the q should not take longer than 20 minutes, but you mustn't fail. Anyway, now you can start killing the boss in the next room and his dog in addition. This is very easy at lv 70.
Now after that you need to open 12 doors, have your pet pull all of the aggro and run to the 1st hall again. Try to kill 2 or 3 mobs including the boss. There is a good chance after al of this you're dead as well and at least 2 elementals are still standing, but they run back in the second room as soon as you die and you can ss and buff up again. Kill the remaining elementals and loot the Heart of the Mountain.

It is possible to find out which dark keeper has spawned. In the room before the room in which Watchman Doomgrim spawns there should be a portrait on the wall. (you will have to open its covering to view who it is). This is also stated on the page that Celem linked above.

here they are - 65,23

this isnt too hard to 5 man. we had a group of 3 x 60s a 59 pally and me the 56 warr.

we opened the 12 cases and the 4 golems came to life and the named dwarf appeared, and slaughtered the guy who opened the lockers.

we rezzd him, and pulled the dwarf alone, if u get just close enough he wont agro the 4 x lvl 54-55 elite golems behind him, so u can take him out, and then just take the golems with some kiting.

65,23 are the rite coords.&nbsp if u go to it theres a horde flight path rite there, walk up the bridge the goblin is the one u return it. its up north past the ruins of thaurissan.

I, a 54 priest at the time, along with a 54 rogue a 55 warlock and a druid in bear form and another druid in moonkin form. It wasn't easy by any means but you just keep everyone healed and the DPS of the group up, like any other fight and
POOF!
complete

1. Gotta go into the "Vault" (1 floor higher and directly East of Lord Incideous) and make sure you have looted a BUNCH of coffer keys

2. Open all the doors in the room, and when u open last one....b4 u lot chest the statutes (Golems) come alive (4 total and 1 Dwarf)

3. Kill everything and then "Heart" is colorful thing&nbsp on ledge under small (center of back wall) door

The only spawns I've run into are

1) Spawns when all the Relic Coffers are opened
2) A spawn in a different area (the hallway towards the patrolling named and a bunch of golems) of a few non-named and one named when the portrait is opened.

Just turned it in.&nbsp Alliance human warlock - if you open the portrait a handful of elitese are spawned.

You need 12 keys (11 regular coffer keys and the 1 main one).

the portrait doesn't spawn any mobs.&nbsp

the name on the portrait tells you who to kill to get the dark coffer key.&nbsp In my case this was 'Ugger' who was around the corner to the north (in the entrance to the slope that leads to Incendius below).

We did this with s 57 warrior 60 shamsham 50 hunter 52 rogue and a 57 mage and the warrior was dead its so easy But maker sure u have the coffer key or your screwed =P&nbsp @@
&nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp |__|

Can you just sell it and not turn it in?&nbsp I don't see much of a point here otherwise because it only pays 85 silver to turn in the quest.

The quest reward isnt what's really important. When you down the boss and open the main coffer door, there's also a chest that has a nice blue item. Worth the twelve relic coffer keys you dump into the event, imo.

Also, you do need 12 relic coffer keys, and the last one drops off the guy that comes when you open the twelve doors. Be careful, it's pretty tough.

you don't need to open that last coffer - the Dark Coffer? - to get The Heart of the Mountain. once you open the other eleven coffers and you kill the Golems that show up (and the Dwarf, Watchman Doomgrip?) a chest opens below the last coffer. The Heart of the Mountain is looted from this chest.

later on,
Rock.

Where in BRD is the heart of the mountian ive asked everybody but nobody knows plz tell i dont have cordnites so just tell me were in BRD thx!

Okay 65,23 is not right...That is in the mountains...There is no path to 65,23...Anyone have real coords to turn it in?

where the hell is the guy that u return it to at? i cant find him can someone plz help me

The guy who said he got the heart of the moutain from mining is nuts.. He must have gotten blood of the moutain

where is that guy? i got that q from one of my party members, so dont know where did he get that

there is no chain attachment to this priticular quest... but there is others you can get from Flame Creast ..cords.. 65.23&nbsp happy hunting

But what's the reward? Just 85s?

were do i hand it in,been to burning stepps

cant find him

I this quest repeatable or can you get only one heart of the mountain and so discover the secrets of only one libram?

Guys i can t follow.

Who drop the Heart of the Mountain?
I don t need the rest of commands.
Is it the Banker ( the guy with all the chest )
or the portrait guy?
and where they are?
crazyt quest near to nobody has done it like Lost Thunderbrew recipe !

We had two priests and that worked really well. 1 holy and 1 shadow.

Where the hell is the shrine of Thaurissan at?

You need to have 12 chest vault keys to do it, need to open it all, then Watchman Doomgrip shows, you kill him he drop the last key and set to go.

So here is what I see happening... you open all 12 coffers, the watchmen and several of his guards come in, and the golems stomp you... party wipes then you restart. So what is a good strat for this?

The coords to get/deliver this quest are 65,23 !

Does this quest lead to anything, or is it the end of the quest line with no reward at all?

you get this q in flame crest, burning steppes

I was in there the other day and open the potrait and mobs spawned on me. There was about 4 elite guards that came out.

About the keys you need 12 of them and after you open all the locks the stone guards or whatever they are called comes to life.

I hope this helped you.