Humans reach adulthood in their late teens and live less than a century. Of course, unstable magic has been known to affect one's lifespan...

Humans vary widely in height and build, from barely 5 feet to well over 6 feet tall. Regardless of your position in that range, your size is Medium.

Your base walking speed is 30 feet.

An ability score of your choice increases by 2, and a different ability score of your choice increases by 1.

You can speak, read, and write Common and one extra language of your choice. Humans typically learn the languages of other peoples they deal with, including obscure dialects. They are fond of sprinkling their speech with words borrowed from other tongues: Orc curses, Elvish musical expressions, Dwarvish military phrases, and so on.

When you make an attack roll, saving throw, or skill check, you can invoke the chaos present in all things, treating any result above 10 as a 19 and any other roll as a 2. You must choose to invoke chaos before seeing the result of a roll. You can invoke chaos in this way a number of times equal to half your proficiency bonus (rounded down), and you regain all expended uses when you finish a long rest.

Exposure to rampant wild magic has made the fiber of your very being unstable. In most worlds, this would cause cancer. Thankfully, here it instead gives you unstable magic powers.

Each time you finish a long rest, roll two d10s. You gain the feature associated with each number rolled until you finish a long rest, as determined by the Fragmented Soul table below. If you roll the same feature more than once, roll again until you get a different result.

 At 1st level, each of these features grants you the ability to cast a cantrip. When you reach 3rd level, you can also cast a 1st-level spell with each of these features. At 5th level, you can cast a 2nd-level spell with each of these features. You can cast each spell gained from each feature only once until you complete your next long rest. You can cast a cantrip gained from this trait at will, as normal.

Your spellcasting ability for these spells is your choice of Constitution, Intelligence, Wisdom, or Charisma.

Each of your Fragmented Soul abilities also grants you resistance to a certain type of damage.

Fragmented Soul