The Outer One

By making a deal with an Outer One, your mind is given knowledge that no one else on the mortal plane knows, and given insight into things that have yet to happen. If choose to continue with this path, you will become the undisputed master of the arcane and knowledge. But beware, as your patron will also curse you with prophetic visions of the future, make you feel pain at the worst possible times, or make it so you are entirely dependent on them.

Forbidden Knowledge

At 1st level, you gain expertise in the history skill and half proficiency in the arcana, perception, insight, and investigation. You can also communicate telepathically with a creature from 150 ft away, even if you don`t share a language. 

Product of the Unnatural

At 6th level, you gain a expertise in the intimidation skill and when ever your get attacked, as a reaction, you can deal 1d10 psychic damage to your attacker, 2d10 if the attack fails.

Elevated Mind

At 10th level, you gain immunity to psychic damage. You can also not have your mind read or be hypnotized, unless done by a celestial, god, or your patron. You can also gain information on your opponent by doing an insight or perception check.

The Thing That Should Not Be

At 14th level, you can your action to summon your patron from beyond the stars. Roll a d20, if it lands below your current level, your patron will interfere and assist you. This action will cost you a spell slot. After this, you have advantage on all spell attacks and can make your opponent roll at disadvantage.