A warlock subclass based around a patron that is a master of arcane magic. This subclass grants access to iconic wizard & sorcerer spells and empowers your spells of 1st level or higher.

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Forge an alliance with a master of the arcane.

You have made a pact with a powerful master of arcane magic such as a legendary sorcerer, an ancient primordial or a mythical greatwyrm. These masters of spellcraft, will bend the weave to their will, accomplishing feats even other spellcasters would only dream of. Such beings are often very secretive and incredibly power-hungry, unlikely to part with even a fraction of their magic lightly, resulting in their pacts often having some ulterior motive...

Level 3: Arcane Spark

As a Bonus Action, you can temporarily tap into your patron's power, supercharging your spells for 1 minute. During that time, you have Advantage on the attack rolls of Level 1+ Warlock spells you cast and creatures have Disadvantage on saves against Level 1+ Warlock spells you cast. This effect ends early if you have the Incapacitated condition, or if you die.

Once you use this feature, you can’t use it again until you finish a Long Rest. You can use this feature twice before a Long Rest starting at level 10 and three times before a Long Rest starting at level 14.

In addition, you gain proficiency in the Arcana skill.

Level 3: Arcane Spells

The magic of your patron ensures you always have certain spells ready; when you reach a Warlock level specified in the Arcane Spells table, you thereafter always have the listed spells prepared.

Arcane Spells

WARLOCK LEVEL	SPELLS
3	Magic Missile, Chromatic Orb, Dragon's Breath, Levitate
5	Fireball, Lightning Bolt
7	Polymorph, Dimension Door
9	Bigby's Hand, Wall of Force

Level 6: Eldritch Catalyst

You can use your knowledge of arcane magic to empower your spells beyond their limits. When you cast a level 1+ Warlock spell, you can increase the spell's effective level by 1.

You can use this feature a number of times equal to your Charisma modifier (minimum of once), but you can use it no more than once per spell. You regain all expended uses when you finish a Long Rest.

Level 10: Spell Siphon

You have Resistance to the damage of spells.

In addition, immediately after you take damage from a spell, you can take a Reaction to gain a number of Temporary Hit Points equal to twice the level of the spell plus your Charisma modifier. 

Level 14: Arcane Champion

Whenever you cast a level 1+ Warlock spell, you can add your Charisma modifier to one damage roll of that spell.

In addition, whenever you finish a Long Rest, you can replace up to two of the level 1+ Warlock spells on your list with another Warlock spell of an eligible level.