You are a Monstrosity.

Yetis are large, muscular humanoids, standing between 9 to 11 feet tall and weighing 300 to 400 pounds. Your size is Large.

Your speed is 30 feet.

You have Darkvision with a range of 60 feet.

The Big Forehead tribe are smarter than your average yetis, but they tend to focus their discipline in narrow ways. Yetis from this tribe may choose a single Intelligence skill and any tool. They gain proficiency in both. When making ability checks with the chosen skill or tool they gain a bonus of 1d4 to the result.

You have resistance to cold damage and are naturally adapted to extreme cold. You are immune to environmental effects caused by cold weather. In addition, you learn the Chill Touch and Frostbite spells. Strength is your spellcasting ability for these spells.

You have Advantage on any ability check you make to end the Grappled condition. You also count as one size larger when determining your carrying capacity.

You have proficiency in the Athletics skill. Your unarmed strikes deal 1d6 + your Strength modifier bludgeoning damage, instead of the damage normal for an unarmed strike.

You ignore difficult terrain caused by ice and snow, and you have a climbing speed of 20 feet.

Your character knows at least three languages: Yeti plus two languages you roll or choose from the Standard Languages table. Knowledge of a language means your character can communicate in it, read it, and write it. Your class and other features might also give you languages.

The Standard Languages table lists languages that are widespread on D&D worlds. Every player character knows Common, which originated in the planar metropolis of Sigil, the hub of the multiverse. The other standard languages originated with the first members of the most prominent species in the worlds of D&D and have since spread widely.