Uncanny X-Men: First Class #6

With the helicarrier threatening to crash, Jean uses her powers to divert the ship and save lives. As the X-Men recover, Lilandra tells them that the Knights have waged war on worlds across the galaxy. Nightcrawler has grabbed Sky Song's sword and is transported to the Knights home. He is full of despair at seeing Xavier's skull there until Xavier, who is in his astral form, wakes up and pulls himself back together. Jean begins to fight the Knights and holds her own until all six attack. Peter Corbeau informs Cyclops that Jean's new powers were caused by solar radiation caused by the Knights.