Dread-Slinger

You have a relationship of some kind with a Demon of black powder and volatile materials.

It grants you powers of explosive and volatile nature, it lives within either you or a projectile weapon you own. 

Slingin Magik

Your pact weapon imbues your ammunition with spells of dreadful origin allowing their ranges to be extended by bullet fire.
You can use your bonus action to imbue a cantrip, invocation or levelled spell into your pact weapon [max.3]. Before making an attack roll you can choose to activate any spell imbued in the pact weapon, this spell will activate after the attack roll regardless of hit or miss and will activate at point of impact. The spells range is from point of impact. 

You can use this feature up to your Cha modifier +1  

Expanded Spell List

The Demon 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	burning hands, faerie fire
2nd	flame blade, scorching ray
3rd	fireball, flame arrows
4th	fire shield, wall of fire
5th	flame strike, hallow

Gunpowder burn

Starting at 1st level, when you reduce a hostile creature to 0 HP, the creature combusts. Creatures within 10ft radius must make a dexterity saving throw or take 1D6 Explosive damage.

 

Volatile Luck

Starting at 6th level, you can call on your demon create small explosions to change fate in your favor. When you make a ranged attack or a saving throw, you can use this feature to add a d10 to your roll. You can do so after seeing the initial roll but before any of the roll’s effects occur.

Once you use this feature, you can’t use it again until you finish a short or long rest.

Explosive Resilience

Starting at 10th level, you can choose one damage type when you finish a short or long rest. You gain resistance to that damage type until you choose a different one with this feature. Damage from magical weapons or ignores this resistance.

Coat in Flame

Starting at 14th level, When you hit a creature with an attack, you can use this feature to instantly ignite the target in an suffocating flame. The target is covered in a blackish blue flame that emits a nauseating smog. If the target is not a fiend, it takes 10d10 fire damage.

At the end of your next turn, the target makes a constitution saving throw. On a failed save the target makes throws at disadvantage until a success is made. 

Once you use this feature, you can’t use it again until you finish a long rest.