While traveling, Whis used his Angel staff to notify the Grand Priest that Dark Saiyans had invaded Universe 7.
Resting a hand on Lord Beerus's shoulder, Trunks asked, "Lord Beerus, what on earth is happening on Earth that even Brother Gohan can't handle?"
Lord Beerus replied, "A group of Dark Saiyans suddenly appeared in Universe 7 and are attacking Earth. There are too many of them, and Son Gohan won't last much longer."
Chapter 378