This quest in its current form seems somewhat broken (although in a good way.)

The first three ambushes function as normal, and Grark will stand and wait for you to kill all the mobs that spawn (although he will ignore and not aggro any normal wandering mobs.)

But when you enter Blackrock Mountain, there are no further ambushes, and when he ends his patrol, and the NPC's spawn, there is no cutscene, and Grark topples over dead without explanation.

It does grant quest credit, though, so if you can make it into the mountain, you're home free.

Soloed this as a 60 hunter in BWL gear. First group was easy kite and kill the two non-elites, freezing trap an elite, pet on the other elite. Had to feign death once on the second group, but that didn't fail the quest or reset the ones I'd already killed. Also had to use a few bandages on myself and my pet while Grark was walking, but pretty easy otherwise with some freezing traps and kiting.
Third group wasn't so hard - I only had to fight two of the dragons at first and killed one before the third one showed up. They didn't do all that much damage. The 5-piece Dragonstalker's bonus and 3-piece Giantstalker's bonus were a big help here, to keep my pet up, though a beast mastery hunter might have had an easier time (I'm marksmanship).
The previous posts here talk about a fourth group, and it looked like one spawned right when Lexlort showed up, but they disappeared in less than a second. I was expecting a final battle but one never came. The executioner attacked, Grark died, and the quest completed.

what comes after this quest? like i am lost were to go now , were do i return it

Double post

Edited, Dec 5th 2006 11:17am by Fetchingomer

Just a couple of my own experiences from trying this last night. It doesn't matter how quickly you can get this guy down to 20% after you've cleared the fortress since he will sit and wait for respawns before he starts moving. So after you get the escort quest, just try to kill the respawns as they pop. This will help a little with adds on your way out the building.

His first stop is right outside the encampment when he spawns the aforementioned two 54 elites and two 59 non-elites. Interestingly, you don't even have to do this if you don't want. We were trying to two-man this (60 druid and 58 shammy), so the first time we did it, the shammy got too far behind and failed the quest, but I was still okay. So we thought we'd just wait for him to despawn so we could restart the quest. Eventually, the four mobs despawned and he just kept on walking and I never failed the quest! If we'd realized we could pull one at a time, we probably would have tried that instead of waiting the ten minutes, but this worked too.

The next group (2 elite dragonkin, 2 elite orcs) we thought we'd try the same tactic of waiting until they despawn and it didn't work. Only Grark despawned this time and we failed the quest. Out of frustration, we thought we would try to take out the group that remained. In doing so we figured out you can pull the dragonkin without pulling the orcs. I hibernated one of them, we killed the other, then the second when it woke up. Then we handled the two orcs separately. I can't give you any strategy for the pulls after this, since we gave up on the quest for the night, but it seems like we'll probably need more than just the two of us if the pulls get progressively harder.