Heroic: Zul'Gurub

I know why you are here. The chains. Why are the chains immune.

The first thing you need to do it kill the Gurubashi Spirit Warrior on the lower platform before the boss.
Once you enter the spirit realm now they will be alive. Taunt one of them and stand on the chain.
The Spirit warrior will use body slam and remove the immune buff from the chains. Do this 3 times and finish of the boss ^^

When entering Zul'Gurub, a Bonus Objective pops up that says "0/4 All Guardians of Jindo defeated."

I couldn't complete the objective and I couldn't understand why, and I was unclear whether it included mini-bosses or some other entities.

Then I realized, I was working on the dungeon in separate sittings, and leaving the dungeon or logging out resets the progress on the objective. And because each boss can only be killed once per week since it's a Heroic dungeon, if the objective resets then there's no way to complete the objective, until after the weekly reset.

The "Guardians of Jindo" are simply the bosses shown on the map of Zul'Gurub: [npc=52151], [npc=52155], [npc=52059], and [npc=52053]. (The Cache of Madness boss does not count towards this objective.)

There is no reward for completing this Bonus Objective, but I enjoy completing objectives when I can, and I was confused because I was having trouble completing this one.

This boss has de voodoo man.

I was DPS and the finder didn't put me in this instance after 1 month straight, so I never saw it before. Since nobody had any thoughts about this fight, here is mine.

Now serious:

The fight begins with a green bubble on the ground. I don't know if it was the healer or the spirit in the back. You have 5 seconds to be inside it. Be in it in more than 3 and get one pissed healer at you. DPS boss down. He will get melee-personal and start lashing 5k hits on each people. It appears to be unavoidable.

Phase 2, the boss will go back to the stairs where you came (but he won't go down) and spawn 3 chains. 4 people should focus on the chains while one DPS should be let loose to kill the adds. (That was me.) Pop-up spirit of the fox (if you are hunter), and DON'T STAND STILL.
Move and blow, you will take out the adds, and draw aggro like an unfortunate ... player. Keep your pet on assist for this, but don't make him draw more aggro, he needs to get rid of your targets, not draw more.
The rest of the party will be busy wearing the chains down and picking up adds you didn't get in time. By all means, leave those already engaged on tanker, but keep the heat off him, keep wiping. If you please the healer enough by wiping the adds, he may have mana left for you. If you get enough spare time, (2 seconds is plenty) you can also land 1-2 shots on the chains, so save some focus to do it with Dots. Serpent sting, anyone?
The boss lets go one big purple blob from time to time that takes some 70k health, and that's why you should not stay still . Get hit by two in a row and die. Avoid the spot where he throws the purple thing, it is pre-warned, and usually he will do it on you. Yes, you have now a big red circle painted on your chest, so you want to draw as least aggro as possible, to leave your pet free to hunt adds. The adds are not elite, and you can almost one-shot them with Arcane, if you are geared enough.

After all 3 chains are damaged or destroyed, the battle ends. You don't actually kill the boss. Like battling Mannoroth. Enjoy.