Prerequisite: Dexterity 15

Your Strength or Dexterity score increases by 1, to a maximum of 20.

After reducing a hostile creature’s hit points to 0 with damage from a melee weapon, that melee weapon’s damage die size increases by one, and your base walking speed increases by 10 feet (to a maximum total of 45 feet), for the next minute.

Also, while you’re only wielding a single melee weapon, that melee weapon’s critical hit range is increased by one, and it may be used to make offhand weapon attacks even if you resolve your Attack action with it.