The Nightmare is a powerful demon encountered in the Fade. This fight has multiple phases. In the first phase, focus on damaging its physical form while avoiding its fear-inducing attacks. It will summon smaller demons; deal with them quickly. In later phases, it will become invulnerable and you'll need to destroy 'Nightmare's Tendrils' or 'Nightmare's Eyes' to make it vulnerable again. Use dispelling abilities if it buffs itself. Keep your party spread out to minimize AoE damage and use barriers/guard to mitigate incoming damage. This is a battle of attrition and careful management.
