Rafael's Singing Blade

Casting time: 1 Bonus Action - Range: Self - Components: V,S - Duration: Up to 1 minute
You imbue a weapon you hold. When you hit with your weapon deal an extra 1d4 force damage and gain one charge. As a free action you can end the spell and gain 1 hp for each charge. If you miss or if the duration expires, the spell ends and no life is gained. This spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).