Although the Cubes were what powered the aliens’ Mothership, they are separate beings from the aliens. Now that the aliens have been wiped out, the Cubes are taking over and causing their own problems on Season 8 of Fortnite. According to the game’s developer, Epic, the Cubes are much more dangerous than the aliens were, and now, players have to fight for their life if they want to survive at all.
“If you think the corruption they’ve caused is bad now, you have no idea what can happen if we let them stomp all over the island,” Epic said in a statement. “It doesn’t matter if you were pro-alien or pro-IO, it’ll take all the help we can get to keep the island from falling. It’s up to everybody — including you — so take my information below and put it to good use.”
Longtime fans of Fortnite know that the Cubes aren’t exactly new. They first appeared in the game back in 2018. At the time, the Cube was just a giant, purple mass. You could attack it, but it didn’t take damage and wouldn’t move until it was ready to do so.
However, this time around, the Cubes are sentient beings. So be ready to attack when one crosses your path.
Source : https://www.distractify.com/p/what-is-the-sideways-in-fortnite-season-8