Bladesong Master

As the elven warriors of old, you blend elegant swordplay and spellcasting into a single deadly discipline. You gain the following benefits:

• Increase your Dexterity or Intelligence score by 1, to a maximum of 20.
• Choose a type of one-handed melee weapon of your choice, you can use Dexterity instead of Strength for the attack and damage rolls with this weapon. If the weapon has the versatile property, you count as wielding it with one hand for class features where this is a requirement.
• On your turn, when you score a critical hit or reduce a creature to O hit points with a cantrip or attack from your chosen weapon, you can make one melee weapon attack as a bonus action.

*As with the Bladesinger wizard tradition, this feat would usually only be taught to elves and half elves, but if the restriction on that tradition is lifted, the race restriction should be lifted at the same time.