History
R'Klll is the ruler of the Skrull Empire. She, the Supreme Intelligence of the Kree Empire, and Empress Lilandra of the Shi'ar Empire discussed the challenge issued by Charles Xavier over the fate of Jean Grey, the host of the destructive Phoenix Force. R'Klll agreed to let the Shi'ar fight Xavier's X-Men on the condition that the X-Men weren't allowed to win.[1]