User blog comment:Lord Jaric/Did something more happen atop the tower/@comment-25555436-20160216212619/@comment-25555436-20160216213629

He said that they were so powerful even the Grimm were "afraid of them", that they could kill a Grimm with a stare. Not that their powers only worked on Grimm.

Basically, he said they were ultra-powerful, that not even the mightiest Grimm stood a chance against them. Nothing about their powers working only on Grimm.