Getting Essence of the Dragon I (Group) [Kar'Zok immunity]

I've done the spider caves a few times and it does seem hard until you get the hang of it. When you get to the entrance of the room where you need to deploy the repellent, you have a 7 minute window to do it easily. If you run in and kill the right mobs quickly, and then pop the repellent, you will end up with the 2 quest mobs alone. They are easier than fighting 2 of the normal spawns in that room.

That is detailed on one of the sites with the info for the quest. One of my guildies found it and it took us from getting wiped by 5-6 mobs to easily beating it very quickly. Now we did it with a Paladin, Necro, and Monk, with 3 healer mercs, so we had some DPS to work with and plenty of healing.

With a little faction work, it's possible to have both the burynai and centaur tasks active at the same time. They overlap quite a bit, so you can work on the start of one while mostly being done with the other.