Boon of Tiamat

You’ve been imbued with a spark of Tiamat's power, which grants you the following benefits:

Elemental Strike. Choose one of the following damage types: acid, cold, fire, lightning, or poison. When making a weapon attack with a simple or martial weapon you may deals an extra 1d4 damage of the chosen type when it hits. You may use this ability a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Elemental Resistance. When you take acid, cold, fire, lightning, or poison damage, you can use your reaction to become resistant to that instance of damage. You may use this ability a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.