Chill of Stygia

You learn to call on hellish cold to serve your commands. You gain the following benefits:

• Increase your Intelligence or Charisma score by 1, to a maximum of 20.
• When you roll cold damage for a spell you cast, you can reroll any roll of 1 on the cold damage dice, but you must use the new roll, even if it is another 1.
• Whenever you cast a spell that deals cold damage, you can emanate a deathly chill until the end of your next turn. The coldness doesn’t affect you or your possessions, and they freeze any surfaces you touch, allowing the scaling of walls, solidification of ropes, and walking across liquid bodies. While the chill is present, any creature within 5 feet of you that hits you with a melee attack takes 1d4 cold damage.