The Jade Mountain Prophecy
Ermine was shown in the library with two other IceWings, Changbai and Alba, when Darkstalker was mentioned. They told Turtle and Starflight about the legend of Darkstalker and that he was a ghost who haunted the IceWings in revenge. When Darkstalker did show up, they fled, knocking over a few shelves in the process. Ermine then attacked Darkstalker along with Changbai and Alba, after the fight all three IceWings bolted away.