The Arbor Wilderness and the Temple of Mythal are, virtually, the last locations that you visit along the main storyline. In the wilderness, you will witness the fights between the Orlais and the Red Templars. You do not need to pick sides, because your task is of greater importance. After you reach the end of the forest corridor, you reach the Temple. Here, you can either do the ritual, or follow Corifeo's factotum. If you know how to perform the rite, it is going to be faster this way and additionally, more profitable 0 you can then ally yourself with the ancient elves. The last stage of the journey is the battle against Samson, who is then taken away to Skyhold where you pas judgment on him.
The way to unlock the location: After you complete the "Here Lies the Abyss" main quest, you gain access to the "What Pride Had Wrought" main quest, the cost is 40 Power points.
Recommended experience level: The recommended level of the party, to complete the quest without major problems is between 16, a 19. The only problems you may have is during the long battle against Samson, towards the end of the quest- first, you need to remember to loot the corpses on the ground, thanks to which you often replenish your health potions.
1) In the Arbor Wilderness, you do not need to fight all of the opponents- dash ahead and maneuver around the fighting groups, to reach the Temple quickly.
2) You will be unable to return to the Wilderness, or the Temple so, pick all the loot on a regular basis.
3) In the temple, you can choose whether you want to start the chase, or perform the rite - after you pick the rite, you will then be able to get around the fighting Templars, along the secret paths that the elves show you.
4) Towards the end of the quest, you can choose who should wield the power of the well- you can either pick yourself or Morrigan - this choice will affect the available dialogue options, later into the game, as well as the support from your party members.