The Shahiid

Your patron is the master at which you trained with for years in order to go to the Red Church. They bestow upon you the power they have, usually in the form of an item of sorts to help you on your journey. Whether your Shahiid had good intentions or bad intentions comes up to what your Shahiid was like. If you had a good Shahiid who wanted to bestow upon you good nature and tithe then you will most likely follow the path of a good natured warlock who seeks only to bring fortune to others even in your time of killing. If your Shahiid had bad intentions then they most likely wanted to turn you into a weapon of mass destruction, leaving nothing but chaos in your wake.

Sincere Askings/Devious Deeds

Starting at 1st level, you have become great in talking to others in order to get what you want. Depending on what your Shahiid was guiding you towards, you get to choose two of the options.

Good: You gain proficiency for Persuasion checks.

Evil: You gain proficiency for Deception checks.

You gain both either way. But depending on your Shahiid you will be asked for one skill over the other by the DM.

Remembrance of Lessons

Starting at 6th level, you can recall the moments of your lessons that your Shahiid taught you. When you make an ability check or a saving throw, you can use this feature to add a d10 to your roll. You can do so after seeing the initial roll but before any of the roll's effects occur. Once you this feature, you cant use it again until you finish a short or long rest.

Iron Wits

Starting at 10th level, memories of you training with your Shahiid start to flood into your head. You catch a memory that seems to prove quite useful for a particular situation. When someone decides to persuade or deceit you, you can instantly figure out if what they say is true or not. Creatures who make a Persuasion check or Deception must roll with disadvantage. You also become immune to being charmed.

To our Lady of Blessed Murder

Starting at 14th level, you realize what and who you do the things you do for. Your devotion to the Lady of Blessed Murder has become unfathomable. You become a being of great knowledge and power and seem to release this effect on those around you. 

Good: Creatures around you become too docile to attack you, if a creature makes an attack at you they must roll with disadvantage.

Evil: Creatures around you become fearful from you and tend to run away from you if they try to make an attack, creatures that attack you must roll with disadvantage.