Unfortunately, the Legion doesn't have a positive relationship with any cosmic-level powers, seeing as we have to stop them from destroying all of existence so often.

The Time Trapper is only force we could potentially appeal to, given its nature of aiding us almost as often as menacing us, but if it wanted to be in contact with us over this disaster, it would've already showed its hand.

Truth be told, the last benevolent force the Legion encountered that had the capacity to destroy an apocalyptic threat was you, Jordan. During the Final Night. But you're no longer at that power level.

Did you have a particular one in mind?