Which album was a band's creative zenith/magnum opus before falling off?

Disagree about he falling off. TPAB is probably one of the albuns of the century and gonna be really difficult someone create an album just like TPAB, on hiphop scene.

All media claims TPAB as a masterpiece and they put Kendrick on one level I guess almost nobody can take. And TPAB isnt my favourite album from him. Mr. Morale is a good LP , btw.