The Arcanist

Your patron is a creature who has vast knowledge of the arcane arts and wizardry. Instead of following down their same path, you pledge yourself to their patronage in return for them imparting their knowledge onto you. Your service can take many forms, from finding arcane artifacts or spells to add to their collection to spreading their good word in hopes of finding new students and disciples to simply allowing them to hold themselves up in their own tower. 

Patrons of this type may vary wildly depending on who you contact. They could be an ancient archmage, a powerful sphinx, or certain gods of knowledge and the arcane, such as Erathis, Ioun, Azuth, or Mystra.

Expanded Spell List

The Archanist lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Archanist Expanded Spells

Spell Level	Spells
1st	magic missile, silent image
2nd	Arcanist's magic aura, magic weapon
3rd	clairvoyance, lightning bolt
4th	arcane eye, faithful hound
5th	arcane hand, teleportation circle

Patron's Knowledge

At 1st level, when you are unable to recall material, your connection to your patron may aid your knowledge. You may add your Charisma modifier to any arcana checks you make.

Magic Adept

At 1st Level, your arcane patron's skill with spells makes you more adept in using your spell slots. Whenever you expend a warlock pact slot, you may cast a cantrip as a bonus action.

Additionally, whenever you deal damage to a creature as a result of a spell you cast, you may deal force damage to a number of creatures equal to your Charisma bonus within 30 feet of you. This damage is equal to your proficiency bonus. You may use this ability a number of times equal to your proficiency bonus, and this ability recharges after a long rest.

Arcanist's Shield

At 6th level, your knowledge of spells and arcane casting allows you to resist the effects of opposing spells. You add your Charisma modifying to saving throws against spells. Additionally, when you succeed on a saving throw against a spell that deals damage, you may use your reaction to take no damage from that spell. You may only use this reaction once per short or long rest.

Mystical Conversion

At 10th level, under your Arcane Patron, you become more flexible with your casting. As an action, you may expend a warlock pact slot to create a spell slot for each level below the expended slot. For example, if you expend a 5th-level pact slot, you may create one spell slot of 1st, 2nd, 3rd, and 4th level. These created spell slots count as pact slots for the sake of your other warlock abilities granted by this subclass. These spell slots vanish at the beginning of a long rest if they have not been expended, and you cannot use this ability again until you complete a long rest.

At 17th level, you may use this ability twice per long rest.

Split-Mind Concentration

At 14th level, through your dedication the the arcane arts, your patron grants you the gift of supernatural concentration. If you are concentrating on only one spell, you may choose to concentrate on an spell simultaneously. If you are forced to make a concentration check to maintain concentration while concentrating on two spells, you only need to make one check. If you fail this check, you lose concentration on the highest level spell you are concentrating on, but keep the lower level spell.

Once your concentration drops on one of the spells or the duration of one of the spells ends after you use this ability, you cannot use this ability again until you complete a short or long rest.