Forgive my ignorance but what impact does speccing into Gravechill have on all the investment into necrotic damage? The "overall recommendations" of the guide would lead me to think investment into necrotic whatever it is - good, but if you take Gravechill necrotic increases no longer matter for Reap.
This leads me to think Reap is not important for damage if you are willing to undercut it in that way but just want to confirm I'm not out to lunch.