Heart of Sin Objectives includes two parts which are Kill Cydaea and Kill Azmodan. Cydaea, maiden of Lust, has a life globe of 132,406. The special skills of Cydaea are the plague spitting and the spider birth. A large amount of spider can be generated by this maiden of lust. When Cydae give birth three rounds of spider, she will climbed to the air by the web. When she comes to the ground, you should get the chance to hit and blow her. Or she will get to the air again. From the map I provide, you can run around in circles. It is a long journey for Monk to defeat the Cydaea. The repair fee is too high, so you shoud choose the breath of heaven and serenity both to heal you as a monk. Anyway I only receive two blue items in additional with no Diablo 3 Gold. Quest complete rewards are XP 9300 and D3 Gold 480 which are too little to repair.
Then you should destroy the Sin Heart and go to kill Azmodan in the Heart of Sin. Actually in my personal opinion, the big Boss is not so tricky compared with the overwhelmed Chamion and Super Unique monsters. This time I would discuss the Azmodan part from the map. When the Black Blood appear, you should run among the four little circles. In the first wave, not run in the rim of the circle. When the middle is almost over crammed with the blood, use your health because the blood will soon disappear. When the minions of Azmodan exist, it is your priority to kill them. Or they would be a big trouble for you. When the battle is over, I only get three blue items and gold 160. I can not resist complaining the mean behavior of Blizzard. The XP received is 9600 and Diablo 3 Gold received 485.
Now it is your high time to return to the Bastion's Keep Stronghold. Enjoy your game. Next time, we will give you practical information.