Elemental Strike

Elemental Strike

You have learned to infuse your weapon or unarmed strike with elemental energy. Choose between cold, fire, necrotic, and radiant. When you hit a creature with one of these attacks, you can choose to deal an additional die of the weapon type in the form of fire, cold, or lightning damage (depending on the element chosen). You can use this ability a number of times equal to your proficiency bonus per long rest.
Drawback: You are vulnerable to the opposite type of elemental damage. (Fire- you are weak to cold and vice versa. Necrotic you are weak to radiant and vice versa)