Mortarion, Magnus, and Angron have all returned to the present day of Warhammer 40K. While Fulgrim survived the Horus Heresy and became a four-armed serpent Daemon, he vanished thousands of years ago.

Warhammer 40K’s most excessive and over the top army is arguably the Emperor’s Children, ... Fulgrim and the Emperor’s Children fell to Slaanesh and immediately got on the excess train.