Your patron is a lord or lady of the Court of Autumn of the Feywild, a being of chaotic power of the storms paired with the trickery of the Fey. These lords exercise chaotic motivations that sway with their fickle moods and carry like the undulating winds. The motives of such creatures can be whimsical, wrathful, a harsh reminder of their existence, or a blessing in disguise for the chance of a fresh start. Their motives may even reflect similarities to other deities in the multiverse like celestials, fey, or elemental leaders. While playing this subclass consider what the dynamic may be in your specific lord or lady and try to implement that in how you roleplay or have your DM select what they may be like. Things to look at would be themes like: chaos, quick-tempered, trickster nature, misdirection, piracy, fresh starts, provision for nature, inscrutable motives, conflict for the purpose of strength and so on! Make this deity your own!

Bonus Proficiency

At 1st level, you gain proficiency in one of the following skills of your choice: Acrobatics, Insight, Nature, or Perception.

(NOTE: DDB currently doesn't have a way to set parameters for a custom set of skills, so the menu will display all of them)

Expanded Spell List

The Archfey of Storms  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.

Archfey of Storms Expanded Spells

SPELL LEVEL	SPELLS
1st	faerie fire, thunderwave
2nd	phantasmal force, warding wind
3rd	haste, lightning bolt
4th	greater invisibility, storm sphere
5th	control winds, steel wind strike

 

EDIT: Because DNDBeyond refuses to allow othe books besides Basic Rules and Elemental Evil Handbook, you will have to manually add Phantasmal Force and Steel Win Strike from the Player's Hand Book and Xanathar's Guide to Everything. Furthermore in other parts of this, you may see more things in which you will need to add this homebrew and adjust it within your character sheets!

Slipstream

At 1st level, you can more control the winds to defend yourself and your allies. If you or an ally that you can see within 30 feet of you is hit by an attack, as a reaction you can add +3 to the target’s AC against that attack. You may use Slipstream a number of times that equals your Charisma modifier. You regain all expended uses of it when you finish a long rest.

Spark of Life

At 6th level, when you cast a spell of 1st level or higher using a warlock spell slot that deals lightning or thunder damage, you can restore hit points to yourself or a creature within 30 feet of you equal to the level of the spell + your Charisma modifier. You can use this feature twice. You regain any expended uses when you finish a short or long rest.

Storm Emissary

Starting at 10th level, your extended service to the Lord of Storms starts to affect your body more. Your veins and nerves change to better conduct electricity and your inner ear now resist the impacts of sounds that would otherwise be devastating. You now have resistance to lightning and thunder damage and gain advantage on saving throws against being frightened.

Storm Lord's Chains

At 14th level, you are now a Herald of the Storm Lord’s realm to execute the wrath of the Court of Autumn. As an action, you may cast the spell Chain Lightning at 7th level without expending a spell slot. You must finish a long rest before you can use this feature again.