Falling

1d6 for every 10 feet (or portion of 10 feet.)
example. 20 foot fall = 2d6 damage. 12 foot fall = 2d6 damage.
Maximum damage from fall is 20d6

Everything falls 500 feet/turn. If your fall <= 500 feet, you will not have time to take an action The only thing allowed would be a reaction if you have one.
If however the fall > 500 feet, then on next turn you may take an action.