"Ferried from an unknown time and place, a haunting presence has been detected. We must now confront the ancient threat growing at our doorstep."
Finding out the best weapon loadout and class combination to overcome the upcoming challenge will be quite fun. Fortunately, Destiny 2 is not too strict on that matter and it's usually more about execution, so you won't have to worry if you are yet to explore the expansion in detail.
The Power cap for all the encounters during the race for the world's first completion of The Root of Nightmares will be 1780, which is fairly close to the level of power you have if you finish the campaign. You still have a few days to go if you want to prepare for the new raid in Destiny 2: Lightfall.
answering the message of