Frost of Cania

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

• Increase your Intelligence 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 cause frost to wreathe you until the end of your next turn. The frost don’t harm you or your possessions, and they create a 5 foot radius of snowy or icy rough terrain around yourself, the radius around you is considered difficult terrain, While the frost is present, if a creature within the 5 foot radius makes a melee attack, it takes 1d4 cold damage. The aura lasts until the end of your next turn. 

Adapted from Frost Winds of Cania by Betelguese90