Path of the Frost Giant

You are the Offspring of a Frost Giant. 
After a lot of training your genes start to manifest as you grow in strength and size.

Blood of the Frost Giant

Your're heritage in your blood thickens as you grow a little colder.

You have resistance to cold damage. You also naturally acclimate to high altitudes, even if you’ve never been to one. This includes elevations above 20,000 feet.

Level 3: Cold of the North

When you enter your rage, each creature of your choice within 10 ft of you gains 1d6 temporary hit points, as icy spirits inure it to suffering. The temporary hit points increase when you reach certain levels in this class, increasing to 2d6 at 6th level, 3d6 at 10th level, 4d6 at 14th level, and 5d6 at 20th level. You can reuse this ability as a Bonus Action while your rage is active.

Level 6: Giant's Might

You grow 1d10 centimeters.

When you enter your rage you grow one size larger and you deal an extra 1d6 damage with your weapons and unarmed strikes. This damage increases to 1d8 at Level 10 and to 1d10 at level 14.

Level 10: Cold as the Dale

You grow additional 2d10 centimeters.

Your blood grew so cold while you rage other creatures of your choice within 10 ft of you gain your cold resistance.

Level 14: Not frosty enough!

While raging magical effects and extreme cold can't lower you movement, stun, incapacitate, grapple or restrain you and don't count as difficult terrain for you.