Frost Walker

Via some means, your body has attuned to the cold, you seem to be able to even control the icy frost, many a benefit comes from this strange coincidence, all you know now if ice is your friend and fire may just be your enemy.

A Touch Of Frost

When you hit with a melee attack, you can deal additional cold damage equal to your current sneak attack dice. Additionally you are resistant to cold damage.

Arctic Aura

As a Bonus Action, you can create a 10ft aura surrounding you that will slow enemies to half of their movement, the aura lasts for 1 minute, you can use this feature a number of times equal to your proficiency bonus.

Free Frost Movement

You gain the ability to freeze water where you touch, additionally you gain a climbing speed equal to your walking speed, able to climb on flat surfaces as you use the ice to latch unto the surfaces.

You also gain Winter Wings, allowing you to glide 5ft for every 1ft you fall, additionally, as a bonus action, you can activate free flight granting a flying speed equal to double your walking speed, the flight lasts for 1 minute, once you use this feature you cannot use it again until you finish a long rest.

Frost Adept Body

You gain resistance to cold damage, which at 13th level upgrades to an immunity to cold damage. However, you are vulnerable to fire damage.

Winter Soul

Your resistance to cold damage become immunity to cold damage, additionally, any cold damage you would have taken is transformed into Ice Hit Points, Ice Hit Points are resistant to nonmagical bludgeoning, piercing, and slashing damage and vanish on a long rest, you can have a maximum as the maximum sneak attack dice of your level.

Absolute Zero

As an action, you can create a 20ft aura around you that will cause all creatures (not including you) will make a DC 28 Constitution saving throw. On a fail, the creatures will gain the Shiver condition. While creatures are affected by Shiver, they will make a DC 18 Constitution saving throw every round, after 3 successes the Shiver condition will end, on 3 failures, the creature will drop to 0 hit points , and become a frozen statue that will melt after 1d10 times 100 years. You can use this feature once per long rest.