Your patron is a master of the arcane art, be it a creature made out of pure arcane energy or an ancient wizard. Regardless, this patron has infused their mastery over magic into you, allowing you to cast spells more often and stronger then the average warlock.

Arcane Prowess

Your patron has gifted you the ability to cast spells more often. You have additional spell splots equal to your charisma bonus ( minimum 1).

Arcane Repertoire

Your patron is the master of arcane energy as such is able to grant spells that other patrons are not able to. You can now learn spells from the wizard spell list.

Mana Veins

Arcane energy flows through your veins now. You are able to cast stronger spells and empower those you already know. Slot Level increase by 1, which scales together with each increase, capping at 6th Level Spell Slot at Warlock Level 9

Eldritch Recharge

You call upon your patron like a cleric calling upon his god to rejunivate the magic running through your veins, allowing you to cast more spells. You regain a number of spell slot equal to your proficiency. Once you use this feature, you can't use it again until you finish a long rest

Arcane Overlord

At level 10 you have reached a point in your journey where you have become a savant in harnessing the arcane energy in your veins. You oveclock your arcane energy production, infusing your flesh with arcane hardness and allowing you to cast low level spells with reckless abandon. For 1 minute get an additional ac equal to your charisma bonus and you can cast 2nd level spells without consuming any spell slots. Once you use this feature, you can't use it again until you finish a long rest