Also, it's no longer "5th Night Free."

When off-peak, standard, and peak were introduced in 2019, Marriott Bonvoy renamed “5th Night Free” to “Stay for 5, Pay for 4."

For a stay of 5 to 9 nights, the lowest-point night is free. For a stay of 10 to 14 nights, the two lowest-point nights are free. And so on, in multiples of five nights.

I wouldn't call a "specific award." It's just how the points are charged on stays of 5 nights or longer.