I really don't have very many criticisms right now, but they really need to fix the Darkness spell. They got almost everything about it wrong.
1. The Devil's Sight warlock invocation should let you see through it. "You can see normally in darkness,both magical and nonmagical, to a distance of 120 feet." Otherwise, it's almost worthless because it gives everyone attacking into and out of it disadvantage. This spell is the bread and butter of several warlock builds because of Devil's Sight.
2. You should be able to cast it on an object you are holding. This is a massive element of the functionality of the spell. "If the point you choose is on an object you are holding or one that isn't being worn or carried, the darkness emanates from the object and moves with it." This in particular really ruins one of the coolest options for warlocks in 5th edition D&D: cast darkness on something that you are holding, and then run around eldritch blasting and stabbing enemies with advantage while they all have disadvantage attacking you. (This only works if they fix Devil's Sight also)
