Indeed, it was Orodruin. But to be precise, the "death of stars" I originally thought of referring to Gil-Galad and the "go-return" was supposed to be about the time when Sauron was taken to Númenor and returned. Then, of course, the "corrupted hearts" would refer primarily to Isildur and then you can add almost everyone else to it...
So, Beregond, it's yours now