Parademons

But one quick shot in the Snyder Cut trailer proves that Snyder’s Barry will be up to the challenge, because he will BE in S.T.A.R. Labs with Cyborg (Victor Stone) when Steppenwolf and the Parademons attack.

When Cyborg first used it, the White Noise Cannon reduced a pair of Apolokips Parademons to shreds.

The CGI in the transformation scene actually looks more convincing than the CGI used for the Parademons throughout the movie.

He later sets the teleporter to self-destruct after he uses it, killing the attacking Parademons, and his living batteries.