While testing out all the classes, I ran across the warlock patrons for fiend and great old one. Fiend has an obnoxiously powerful feature (as per 5e rules) for getting temp hp on killing blow. Great old one (in the rule books) get awakened mind, allowing them to have telepathy. This is ridiculously good in MANY roleplay options. OBVIOUSLY, this would be too difficult to implement in the game and so its removal makes sense. What doesn't seem to make sense, is how they have nothing to replace it.
This is very strange considering the massive rework the ranger got to make it functional (which I realy like btw). I would recommend a replacement feature for awakened mind (the level 1 feature for great old one warlocks), rather than just the straight removal of it. Maybe giving them immunity to charm or the ability to cast charm person at will, or w/e, but at least something. Otherwise, I'm really enjoying the game the class.