Overwatch

You have learned to read and predict your opponent's movements, sometimes knowing what they will do, even before they know themselves.

• Once, on your turn you may mark a hostile target until the beginning of your next turn. If the marked target either willingly moves, or teleports, you may use your reaction directly before to make a ranged weapon attack against the target.
• The mark is lost if you lose sight of the target, if the target takes the Disengage action, or if you move.