Necrotic Disturbance

Your time studying dark magic has led to some unusual side effects. You gain the following benefits:

• Increase your Intelligence or Charisma score by 1, to a maximum of 20.
• When you roll necrotic damage for a spell you cast, you can reroll any roll of 1 of the necrotic damage dice, but you must use the new roll, even if it is another 1.
• Whenever you cast a spell that deals necrotic damage, a necrotic chill surrounds you until the end of your next turn. The necrotic chill creates an area of cold air 30 feet around you making you resistant to necrotic damage for the duration. While the necrotic chill is present, any creature that comes into contact with you or that hits you with a melee attack takes 1d4 necrotic damage.