The hunger of Hadar spell (PHB, p. 251) creates a black void of darkness, which cannot be penetrated by light. This means that no one can see in, and those inside cannot see at all, which is a handy way to damage and control enemies since they don't know which way is out.
This also means that characters cannot easily attack those inside.
The Devil's Sight eldritch invocation, however, enables a warlock to see normally in magical and non-magical darkness.
Does this enable the warlock to see into the area of blackness created by hunger of Hadar and attack creatures inside? Are there any other sight mechanics that allow someone to see in or out of the spell?
Best Answer
If the Warlock is inside, NO. If they are outside, Maybe.
The real key here is the wording on Hunger of Hadar. The spell breaks itself down into being inside the sphere, and being on the outside looking in. We'll use that same breakdown as well.
(emphasis mine)
Inside
If you are fully inside of the sphere you have the blinded condition. Devil's Sight does nothing to counteract that condition.
Outside
This is where the RAW gets fuzzy. As Justin T mentioned,it would be a DM discretion issue on "blackness" being the same as "darkness". Within the text of Hunger of Hadar it mentions opening "a gateway to the dark between the stars". This uses the word dark, so I would probably rule that you can see into it. At the end of the day though, it would be up to your DM.