Far From Home

As you are far from your home plain of elemental air, periods of extended flight are more difficult for you. This gets easier to maintain as you get stronger and increase in level, but it will never be as easy as it would be if you were home. Whenever you begin your turn aloft as a result of using your innate flying speed you must succeed on a Constitution Saving Throw or fall Prone and have your Fly Speed reduced to 0 ft. for the rest of this turn. You must also succeed on this Constitution Saving Throw if you are moved against your will mid flight, with the same results upon failure.

The DC for this check is 14 + (number of turns of continuous flight).

The DC for this check gets lower as you increase in level as indicated by the table below.