Fear Itself by Matt Fraction

A long-dormant Norse god of fear returns and plunges the world into panic, empowering villains and corrupted champions into terrifying avatars that ravage cities and upend the balance of power. As terror spreads, Earth's heroes forge desperate alliances, confront personal traumas, and make painful sacrifices to stop a force that grows stronger the more frightened people become. The crossover examines how fear reshapes societies and relationships and chronicles the moral costs and resilience required to resist a nightmare made real.