You can grow and shrink parts of your body to a certain point.
Size Shrink
You can use an action to shrink yourself down to 8 inches (MAX) and gain advantage on stealth if you are below 3 feet tall. While small, you have to roll con saves every turn to keep yourself pressurized (each con save has to be above 15).
Size Grow
You can use an action to grow parts of your body, so they are as big as yourself to cover more area and deal more damage, your speed is halved, and you have to roll strength saves for every attack you make while grown (each strength save has to be above 15 in order for your attack to hit).
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