Burst of Overwhelmingly Monstrous Power

You grow more familiar with the monstrous heritage deep within your blood and sustain the power for longer periods of time.

STR +1 or CON +1

When you use your Burst of Monstrous Power feature, you can sustain it for a number of turns up to your base constitution modifier (maximum of 5). When the effect ends, you gain levels of exhaustion equal to the number of turns the effect was active(minimum 3). These levels of exhaustion cannot be removed by magical means and you must remove all levels of exhaustion before you can use this feature again.