The Frostborne

The Frostborne, or the Winter Children, as they are sometimes called, are those who possess innate magic from a distant familial connection to Auril, the goddess of winter.

Because they prefer an extremely cold climate, the Frostborne typically live together in small villages or settlements high in the mountains or deep in frozen caverns. Often, they will gravitate to gateways between the Paraelemental Plane of Ice and the Prime Material Plane, setting up a vigil to keep the frozen monstrosities of the plane at bay.

Unlike the arcane energy that flows through their veins, Frostborne are typically warm and charming up until the moment you cross them, wherein the will release the cold fury that is always brewing just beneath the surface.

Frozen Flame

Starting at 1st level, your connection to Auril allows you to reshape the arcane flame that flows through your spells. When you cast a spell that deals fire damage, you can choose to have that spell deal cold damage instead. All other effects of the spell remain unchanged.

Acute Cold

Starting at 6th level, the arcane cold that flows through you becomes more powerful. When you cast a spell that deals cold damage, including spells altered by your Frozen Flame ability, you can add your Charisma modifier to one damage roll against one of the spell's targets. Additionally, you can spend 1 sorcery point to become resistant to cold damage for 1 hour. 

Child of Winter

Starting at 14th level, you are truly at home in the icy corners of the world. You gain resistance to cold damage, and immunity to cold damage if its source is a spell of level three or lower. In addition, you ignore difficult terrain created by ice or snow. When you start your turn in difficult terrain created by ice or snow, you can move up to 20 feet in any direction without provoking opportunity attacks.

Deadly Cold

At 18th level, you have become a master at altering your arcane energy to more efficiently distribute your icy destruction. When you use metamagic to alter the effects of a spell that deals cold damage, including spells altered by your Frozen Flame ability, the cost in sorcery points is halved (minimum of 1).