Go to VIP and walk north-west to the teleporters. Go up the stairs four times and you will find the teleporter that leads to the Quest.
Note: You will need level 300+ to pass the door.
After entering the quest, head to the west until you reach a door to start the quest.
Past the door, you will be greeted by a Morgaroth, three Orshabaals and three Demons.
Kill them and continue heading to the west and heading up the stairs.
Up the stairs you will be challanged by ten Orshabaals one by one in a one sqm passage.
Past the one sqm passage, you will find yourself in a big room with. Simply follow the road facing alot of monsters, such as Morgaroth, Orshabaal, Hellhounds, Lost Souls, Ferumbras, Ghazbaran until you find yourself infront of a teleporter here:
Note:Past the teleporters, theres a Phrodomo waiting for your arrival.
After killing it, follow the road to the south west, facing a few Orshabaals
until you reach this point, follow the road to the south east then, facing even more orshabaals.
Now follow the road to the west, north west
until you reach a teleporter here:
By entering the teleporter, you will be faced by the first of the last 4 bosses, Verminor on a small island
After killing it, a teleporter will appear, allowing you to go to the next island where you have to fight a Charizard.
Kill it and enter the teleporter to get to the next island, containing a Daitya.
After killing it, you are able to enter the teleporter to face the final boss, a Snorlax.
Now simply walk into the teleporter in order to get to the reward room.