Greetings,
Illithid Enclave is the last solo content instance, the last quest in Whispering Caverns (with the exception of Dread Vault), at the moment. So, its node farming is better quality than the other instances. The least rank of runes/enchants is Rank 3, and can get up to Rank 4. There are 7 proffesion nodes. I've had runs with over 20+ Rank 4s.
It would take you approx. 6 mins per run (maybe even less), it's not hard at all to make 100k+AD/1hr selling Rank 5 enchants (just hope to get Dark/Radiant/Azure enchants, since everything else goes for shit).
(Thanks to FranlkinZero for mentioning it: There is actually +1 node & a chest in a hidden area, that you can briefly spot at 1:31. You might want to look into it, though bear in mind that the node is fairly guarded, while you can loot the chest for free.)
- How to do reruns?
(IMPORTANT NOTE: Do not go to the NPC to finish the quest, or otherwise you will need to find someone to share it with you so you can run it again!)
After finishing your run, just hit ESC, open your menu, and follow the next steps:
ADDITIONAL HINT: The reward for the quest is "Cloak of Lesser Etherealness". It's an infinitely usable item in your inventory that grants you invisibility for a short period of time, and can be used once per hour. I highly suggest that you get the reward the first time doing it (also, it isn't stackable, you can only have 1 of that item), since you can just bypass the fight with the intellect predator.
Have a prosperous farm.
If you found this useful, repping is highly encouraged.