Frost Brand Shortsword

When you hit with an attack roll using this magic weapon, the target takes an extra 1d6 Cold damage. In addition, while you hold the weapon, you have Resistance to Fire damage.

In freezing temperatures, the weapon sheds Bright Light in a 10-foot radius and Dim Light for an additional 10 feet.

When you draw this weapon, you can extinguish all nonmagical flames within 30 feet of yourself. Once used, this property can't be used again for 1 hour.

Vex (Mastery): If you hit a creature with this weapon and deal damage to the creature, you have Advantage on your next attack roll against that creature before the end of your next turn.

Finesse: When making an attack with a Finesse weapon, use your choice of your Strength or Dexterity modifier for the attack and damage rolls. You must use the same modifier for both rolls.

Light: When you take the Attack action on your turn and. attack with a Light weapon, you can make one extra attack as a Bonus Action later on the same turn. That extra attack must be made with a different Light weapon, and you don't add your ability modifier to the extra attack's damage unless that modifier is negative. For example, you can attack with a Shortsword in one hand and a Dagger in the other using the Attack action and a Bonus Action, but you don't add your Strength or Dexterity modifier to the damage roll of the Bonus Action unless that modifier is negative.

Proficiency: martial, shortsword Source: Dungeon Master's Guide (2024) p. 263