Your character gains beastly magic, gaining as many of these features as you like:

• leaking shadow
  • their blood, tears, etc all seem to be inky black and leak from them constantly.
• Enhanced power and mass
• smog breath
  • breathes or leaks smog
• destructive step
  • plants wither where they walk
• fear sense
  • seems to be able to tell when one is afraid
• night vision

These features are flavored as magic, but don't function like proficiencies or innate magic, as they can't be upgraded.