Force magical powder into firearms for explosive effect   You've focused on studying the way the natural laws interact with magic and how much of magical power you can infuse into black powder or firearms. Some special chemical reactions can be enhanced with magic.  

Level 3: Firearms Proficiency

You become proficient in handling and firing firearms. Add your Proficiency Bonus to Attack rolls with firearms.  

Level 3: Infuse Firearm

As a Bonus Action, you can infuse a firearm with spell power. When you make a Spell Attack, you can choose to add the spell’s effect to the firearm’s damage before rolling for the attack.
The Infused Firearm retains this power until you fire it.
The effect from Infused Firearm only applies to the first hit.  

Level 6: Magic Bullet

As a reaction, you can reroll a missed firearm attack or direct the attack to another target within 30 feet of the original target. At level 12, the bullet can bounce once more, allowing you to make an additional attack against a second target within 30 feet of the first. At level 18, the bullet can bounce twice, allowing a third attack.  

Level 10: Empower Grenade

You can infuse a bomb or grenade with the magical power of a Spell. By expending an additional spell slot, you add the damage from a spell to the grenade’s damage rolls.  

Level 14: Explosive Power

By consuming a dose of explosive powder (as a Bonus Action), you become Empowered for 1 minute. During this time:

Your unarmed and weapon attacks deal force damage.

When you deal damage, you add 5 feet to the area of effect of any explosive or area-based attacks. For example, increase a Sphere by 5 ft Radius or increase the width or length of a Line.

You can reroll 1s on your damage dice but must take the new result.

You can use a Spell slot to increase one of your ability scores by 2 even past its maximum. If you use this ability again it replaces the ability score increase from the previous use.