The Immortal Winter

Your patron is a strange and powerful dragon  known only for their wrathful winters and cold summers. They are the last of their kind and are trying to pass on the protection of their powers in their offspring to their followers. Their only desire is to see that if they fall, their offspring carry on the balance of the seasons as not to cause an extinction event across the world. Without them, winter would never come,  thus meaning summer never ends.

Unforgiving Cold

A silver or white dragon wyrmling has been granted as a companion (use monster stat block). Your companion only does cold damage with every attack. However, once per long rest you can halve the movement of an enemy with an attack from your companion. You can use a bonus action to command your companion to take an action, otherwise it will take the dodge action.

Winter's Bite

You gain the ability Frigid Winds, usable a number of times equal to your proficiency bonus. For one minute you create a 30 foot sphere of a swirling ice storm that reduces the movement of all hostile creatures within it by 15 feet of movement.

Increased Trust

You can now cast all previous spells granted to you by  your Patron a number of times equal to your proficiency bonus without using a spell slot. You also gain these spells castable once when you can cast that level of spell. All uses refresh on a long rest.

Winter's Rejuvenation

You encase yourself in ice for two rounds making yourself immune to cold damage but with the petrified condition. Should your health drop to zero you become incapacitated and drop this form, losing any benefits it may have given. At the ends of the two rounds you gain the benefits of a short rest. Usable twice per long rest