We will go on with the rogue's looting in the third heroic instancing.
In the steam one:
The first boss: Carry with you the badge and kill the first group of imps firstly. Here you can ask the tank for help to keep an eye on the water and imps.
Usually one HP and one activation will be enough for the attacks. You can come here after your attacks in the marsh instancing. When you are attacking with the fourth boss in the marsh instancing, you should leave behind the tranquilty to the first boss in the steam instancing.
If the tank here have no strong hate, you can instead demand the rogue to counter the water.
The second boss: No more details about it. It will take shorter time to get there in the usual way. Disregard the imps before the second boss and keep some distance from him, then you can bypass him.
Remember to attack firstly the imps and then the boss,
The third boss: I recommend that you sap and clear away the 3 groups of imps before the boss. Set aside some HP to kill the water trunk and also the boss. It is really a piece of cake.
In the slave one:
The first boss: Get closer to the door god in stealth. With the tank in charge of two imps, you can seckill them with your weapons. Going on with the attacks upon them and also the boss.
The second boss: I recommend you bypass the three-member team in the front of the boss and kill the second team since it will take no more than 1 minute to deal with the second group. You are supposed to kill them firstly and then you can deal with the boss.
The third boss: Rush staightly to the boss. Pay attention to the two monsters in your way there. 
The STK one:
The first boss: It is worthy attention that you can not sap the door god at the right beginning. Get close to the corner in stealth. Stun the two humanoid and the undead monsters there, then you can attack the door god.
Here the team leader should get clear of the distribution of the DPS.
The moment you summno the elementals, you can lethal strike them. Both the tank and other DPS should take responsibility to deal with the elementals. Since the boss's lightening chain will cast some damage to the DPS, you should accordingly attack the boss at his back, which will relieve the healing pressure.
You are prohibited from entering into the first boss's room since the imps there will surely drive you to death with their attacks.
Usually you will be required to kill two groups of elementals, while bypass the third group, and then you can seckill the boss. Though you can head for the corner directly or creep to the right or left side to seckill the boss, it takes great effort to accomplish. Therefore, you can choose to clear away some monsters.
The second boss: Creep to the column and attack the boss, you are supposed to avoid the arcane explosion while disregarding the imps in the middle of your way.
In the mage one:
The first boss: It will take some efforts to counter the bear tank, together with some imps. Or simply you can go straightly to the boss and drag the tank to the side. Take care of yourself, in other words, your should keep yourself from stun spells. Keep the healing at some long distance. It will be fine if you have pushed the boss.
The third boss: There will be four door stopper monsters at the last corner in the room of this boss's.  Before your entrance, you should firstly sap it. And you are supposed to clear away all the imps in this room, otherwise, you will be punished. Some tricks work well here. You can demand a rogue to range attack the boss, and disappear soonly after the attacks. Then you will see the disapperance of the boss's three balls. Now the tank is required to rush to the boss in no time and attack it.
It is worthy your attention that you should attack the boss only after you have accomplished all the things above.
The distance between your team member and the boss will be significant in your attacks. What's more, you should bear in mind that you should attack the imps firstly and the boss next.
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