Help with andashim mission

Hello,
ive been stuck at this mission for almost 4 days now its driving me insane.

Im not sure on exact mission name but it starts with the lock of andashim and involves doing 3 trials.The area it starts in seems to be very low populated whatever time i try to play. Im usually doing mostly npc group with a few players.

Everytime it has failed with the 'enraged djinn' at the end. he rapes the partys ive been in so fast i dont know what to do it seems way to strong , everyone is always level 20 and with 3-4 monks in group nothnig seems to work. This named djinn comes with 2 adds. but can maybe get 1 add to 50-75% before its a wipe they do so much damage and are tough+ having to keep a weak npc up or its a failure also is a pain.

If anyone has any advice especially those who completed it would really help me. thanks

I henchwayed this actually and got masters. It's really easy if you know what you are doing.

Simply put: Take it slow. To elaborate, you need to have a team that can spike the Elementalist Djinn boss since he is the main DPS of the boss team. Bring a SS Necro with Reckless Haste (Vital to stop the dervish boss), either a Ranger or Mesmer with interrupts and 2 monks, rest up to you. When you get to the boss, just kick back and wait till the Fire Djinn takes point the SPIKE. Hero rangers&mesmers are deadly accurate with interrupts, and with him being kept busy have the SS take care of the dervish and everyone else kill the Fire Djinn. The paragon boss is a joke, so ge thim last.