The Arcane

Whether through a direct contract or a more abstract connection, you have developed a bond with a patron of pure arcane prowess. Whether a god of magic, or an unfathomably ancient spellcaster, they have granted you with magic and ties closer to the arcane than most other casters. 

Expanded Spell List

The Arcane 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.

Fiend Expanded Spells

Spell Level	Spells
1st	Magic Missile,  Detect Magic
2nd	Locate Object, Scorching Ray
3rd	Glyph of Warding, Minute Meteors
4th	Phantasmal Killer, Private Sanctum
5th	Cone of Cold, Conjure Elemental

Prodigal Insights

Starting at 1st level, your ties to the very essence of magic give you insight into the inner workings of all things magical. You gain proficiency in Arcana. Also, if you would add your proficiency bonus to an ability check using Arcana, add twice that amount instead unless it is already benefiting from a proficiency doubling effect like expertise. 

When you cast detect magic, you also learn the spell involved in or used to create the magical effect instead of only the school of magic. If there was no spell involved, you gain some other additional insight into the nature of the magical effect. 

Mystical Protection

Starting at 6th level, you can call on your patron to protect you from magic that seeks to do you harm. You gain the following reactions,

-When you would take damage from a spell or magical effect, you can use your reaction to reduce that damage by an amount equal to your Warlock level.

-If you would fail a saving throw to avoid the effects of a non-damaging spell or magical effect, you may use your reaction to succeed instead.

You can use each of these effects once, and you can’t use each again until you finish a short or long rest.

One with Magic

Beginning at 10th level, when you cast a spell that requires you to make an ability check as a part of casting that spell (as in counterspell and dispel magic), you add your proficiency bonus to that ability check. At 17th level, you add twice your proficiency bonus instead. 

Arcanum Mastery

Starting at 14th level, when you cast a spell using your Mystic Arcanum feature, it is cast at the highest level of your Arcanum spells instead.

At 20th level, the maximum level for your Mystic Arcanum spells is considered to be 10th level spells.