The Scholar

You have made a deal with a being of extraordinary intelligence, an archmagi, or curator of knowledge, be this a dragon with a horde of knowledge, a leading mage within the world, or an eldritch librarian, maybe even a group of mages, that hire you as security, or as an assassin for their group. They share with you their knowledge of magics and often ask for you to bring them more in return.  

The Masters Tome

1st level feature of the Scholar

At first, level when you pick this subclass you are granted access to the extraordinary magical knowledge of your patron, and their knack for arcane flexibility. You gain access to the wizard spell list, and at any time you would regain your pact slots, you can change the warlock spells you have prepared.

Any ability that allows you to learn and record spells, such as the ritual caster feat or the book of shadows invocation or having a wizard spell book yourself, you can copy the spells you are given by your patron at half cost

Master of Knowledge

1st level feature of the Scholar 

You learn the guidance cantrip, it does not count against the spells that you know, and expertise in one intelligence skill. Additionally, as a reaction whenever you make an intelligence skill check you can add your charisma modifier to the roll. You can do this a number of times equal to your charisma modifier per short rest.

Signature Spell

6th Level Feature

In their quest for more knowledge, your patron lets you tap into their infinite arcana. You can choose one 1st level spell from the school of divination. You can cast this spell at will without material components or expending a spell slot.

Browse the Tomes

10th Level feature

You can reach into your patrons' wellspring of infinite knowledge, you gain the ability as an action to cast legend lore and commune once per long rest, this does not consume a spell slot or material components 

Infinite Arcana

10th Level Scholar Feature

You are granted even more of your patron's arcane knowledge as they empower your spell-casting. You can choose one additional 1st level spell from any school and cast this spell without expending a spell slot or material components.
Additionally, when you cast eldritch blast, you can instead elect to fire only one bolt, this bolt hits as with the magic missile spell

Ultimate Arcana

Choose a spell from first and second level, you can cast these spells at will at their lowest level