Frigga and Loki
"Hela," he dropped the very salty name. "If someone in this universe knows, it is her." The Goddess of Death was a terrifying figure. The most terrifying aspect for Loki was that she might be able to get around his barriers and command him in his undead form. That was nothing he could let happen. "But I fear she would be less than inclined to... help. The only person my dear sister helps is herself." And his main powers had originated in this universe. Information from other universes could guide him but he could never take them from granted.