Under the Infernal Sphere of Influence on the trait Lords of the Nether is as written
Lords of the Nether 65pts: Nether Lords 2
However, when looking up Nether Lords under abilities section of the book the ability is not considered Nether Lords X. What is this ability considered Nether Lords or Nether Lords X?
Ethereal Talons (Ethereal Sphere of Influence) & Artificer (Healing Sphere of Influence) do not have point values. I cannot assume they are free since free traits are labeled as 0pts.
Nether Lords is meant to be an X ability where X is how many Traits from the chosen sphere you get. So if you took an ability or hero talent that increases X you could make this ability stronger.
The point costs for
Ethereal Talons: 9pts
Artificer: 12pts
These will be updated in the upcoming FAQ n Errata. I expect this sometime towards the end of next week.