I just started playing Neverwinter yesterday and do not know a lot about it. However I have found a quest and right at the beginning of it there are 2 urns that you have to destroy to keep the mobs from spawning.
However these mobs give xp, money and loot.
I have farmed them from 18-22 and I am still getting xp.
If you accidentally destroy the urns you can always leave the area and come back. This will reset the area entirely.
The best part about this is that the town is right out of the quest zone.
The quest is called "Trouble at the broken crown".
I believe you get it around 18 or so from the main quest guy. Again I do now know the names of most of the npcs and anyone that wants to comment so I can edit this for more accurate information feel free to. So far I have been grinding here using auto attack mostly and have made over 6g. At my level and on my first character this is pretty op for leveling and gearing. Make sure you bring potions as you will go thru them. The mobs are EXTREMELY easy to kill. I am sure you could set up a bot here to grind mobs and not hit the urns for an infinite amount of money. Just come back to identify and sell items.
Picture of the location and mobs.
https://i.imgur.com/1iOLbTF.jpg
This one just shows a lot of loot on the ground. I would upload a video but it would not show much else other than me killing things and loot dropping.
https://i.imgur.com/2MXKBVK.jpg