The Attuned

The Attuned is an Inventor who grew interested in messing with firearms and mixing in magics to help improve them, she trapped herself in a Demi-plane and is very unable to test her glorious creations so now she signs deals with mortals for her experiments, those mortals test those inventions with the added bonus of keeping the power of those items. 

 

Expanded Spell List

The Attuned 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.

The Attuned Expanded Spells

Spell Level	Spells
1st	expeditious retreat, command
2nd	blindness/deafness, invisibility
3rd	counterspell, dispel magic
4th	fire shield, dimension door
5th	hold monster, Animate Objects

The Inventors Focus

Gain proficiency in a Tool, as the Attuned blesses you with her Knowledge of a certain craft.
Gain proficiency in firearms, as the Attuned needs you to test her weapons with skill.
Using a bonus action you may summon a Pistol and use it as a normal firearm, this weapon can be destroyed or disarmed but only requires a bonus action to summon another one. you may only summon one pistol at a time, summoning one while the other is fine teleports the first pistol to your hand. You may use the Pistol as an arcane focus, and channel spells through your firearm.
When casting Eldritch blast through this focus you may not fire multiple beams and instead focus them into one attack and the damage now deals 2d6 per blast infused. (Example: at 5th level this feature does 4d6 in one attack as opposed to firing two beams of 1d10 each.)

All Invocation effects that involve Eldritch Blast still apply to this feature.

Improved Focus

Congratulations your testing has proved fruitful and you focus now improves with added features.

When using your focus to cast a cantrip you may also unleash any loaded round within the Pistol shooting an enemy alongside casting the cantrip, granted you haven't fired the shot this round, additionally the Pistol now lets you reroll any 1 rolled when dealing damage with the Eldritch Blast cantrip through this focus, if you re-roll and land on another 1 you must use that new roll.

Inventors Mystical Powder

Once per short rest and with using a reaction you can summon mystical powder to fill your Pistol, using this potent powder in your Focus allows one to improve there spellcasting temporarily, making any spell you cast this turn be treated as if it were upcasted one more level.  

Finished Product

When you use the Pistol to cast the Eldritch blast cantrip focusing the blast into one attack, you may choose to change it into a 90ft line attack that deals half damage on a successful Dexterity saving throw, with the DC being your Warlocks spell save Dc.

Additionally when a creature fails this save they become vulnerable to piercing damage until the end of your next turn, if the creature is resistant to piercing damage it negates leaves the creature without resistance until the end of your next turn, and when a creature is immune the effect makes it resistant to piercing until the end of your next turn.