You can Avert your Eyes when a creature subjects you to an effect that the DM determines requires you to see it, such as a Medusa's Petrifying Gaze. To Avert your Eyes, take a Reaction to look away. The creature is considered to be [[Heavily Obscured]] until the end of your next turn. You can end this obscuration at any time (no Action required), but upon doing so must immediately make the save.