it's showing the future of Darkseid. Even the Reaper must die, as DC has now teased they are killing off Darkseid in the next big event ahead of the debut of the new Justice League title ...
Ask readers who DC's most powerful villain is, and many will say Darkseid – but the publisher ... he'll never actually die, he'll simply keep evolving until the end of time.
The only potential drawback to casting Brown as Darkseid is his age. He’s sixty six, which, of course, doesn’t mean he’ll die tomorrow, but he may not want to be wrapped up in a multi movie arc.