Bladesinger (5e Feat)
From D&D Wiki
As the elven warriors of old, you blend swordplay and spellcasting into a single deadly discipline. You gain the following benefits:
- You can use any melee weapon with the light property as a spellcasting focus, if you wield one.
- All one-handed melee weapons are considered to have the finesse property for you.
- When you score critical hit with a cantrip or reduce a creature to 0 hit points with one, you can use your bonus action to attack with a finesse weapon.