While Franmalth attempts to absorb Natsu and Lucy's souls, Mirajane discovers the secret to the demons' immortality in Hell's Core, right before Seilah unleashes the restraints on her own power to take on Mira.
You people really have no idea how 
fearsome the Nine Demon Gates are.
أنتم لا تملكون أدنى فكرة كم هي مخيفة أبواب الشياطين التسعة