Potion of Flying

This potion's clear liquid floats at the top of its
container and has cloudy white impurities drifting in
it.
This potion gives you a flying speed equal to your
walking speed for 1 hour. If the potion wears off
while you're flying and nothing else is holding
you aloft, you must use your movement to
descend. If you fail to land before one minute
passes, you fall.