Frostblood Sorcery

As a frostblood, you hail from the cold reaches of the world, and the depths of the permafrost. Wintry magic from the area has suffused your blood, and gifted unto you the ability to manipulate ice and cold.

Body of Frost.

Starting at level 1 you gain resistance to cold damage.

Frozen defense.

Starting at level 1, you gain a +1 bonus to your AC for one minute as some of your cold magic weaves itself into icy armor.

Icy Heart

Starting at 6th level whenever you cast a spell that would deal cold damage you also add your constitution modifier to the damage.

Wintry strikes

Starting at 6th level you gain the ability to spend two sorcery points and cause your weapon to deal extra cold damage based based on your charisma modifier (minimum 1) this effect lasts for 1 minute.

Permafrost.

At 14th level you gain resistance to fire damage as your body's innate magic wards off heat and flame.

Frostfire

Starting at 18th level you gain immunity to cold damage. In addition, you can now spend 4 sorcery points to change the damage type of spells that deal fire to cold damage.