Alchemically Infused - Dragon's Lightning

You have been infused with the power of a Dragon, specifically of the type associated with lightning. Each creature that is infused in this way has different appearance changes depending on the creature. Some may gain draconic eyes, some may grow scales, others may just gain a resonant voice. However your appearance changes, you will always gain the following benefits from the infusing process:

• Breath Weapon: When you take the Attack action on your turn, you can replace one of your attacks with an exhalation of magical energy in a 30-foot line that is 5 feet wide. Each creature in that area must make a Dexterity saving throw (DC = 8 + your Constitution modifier + your proficiency bonus). On a failed save, the creature takes 1d10 lightning damage. On a successful save, it takes half as much damage. This damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10). You can use your Breath Weapon a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.
• Draconic Resistance: You gain resistance to lightning damage.