*only doable by a cleric, cw, or tr due to having "flying" dodges.*
The final boss in neverwinter can be killed with ranged abilities while not having to worry about adds and some of his dangerous attacks (all but the hands that come up cannot hit you).
If you want to just get back into the boss room after dying, check the blue text.
First, go to the start of the bridge to the boss room. On the right side, jump up to the first column on the handrail. Then jump and shift straight along the handrail. This will let you get over the invisible wall so you can get to the edge of the circular room. Jump down to the floor on the other side of the invisible wall and start making your way around the edge of the room. When you get to the second opening, jump and shift at the last second and you will be able to walk on an invisible floor that seems like it was perfectly designed for us to exploit. You will then walk around to the left to get closer to the boss and find a spot where you can get the closest to him.
Next, another person in your group will bug into the boss room by using an invisible staircase on the left side of the bridge. Start by jumping from the stairs at the start of the bridge to the left handrail. Walk along the edge of the handrail after you get on until you reach the column to your left. You will then jump then shift straight along the handrail because there is a hole in the invisible wall right here. After you make it there, just keep jumping and pressing w as you go along the invisible wall and you will be able to jump up and over the gates to the boss. The boss will need to be dragged to the guy on the cliff where the invisible floor is, so aggro the boss and quickly run to the edge closest to the first person. The first person will now be able to attack the boss until it dies.
This is great for when groups crumble at the last boss, so you can two man it easily and get some free loot.