Satan chuckled. "Not bad, human mage. Let me give you a spell in return."
Satan cast Infernal Flame Wrath. Multiple giant fireballs rushed toward the mobile fortress. Emris cast Ice Wall. The Sentinels, Paladins, and spellcasters inside the mobile fortress used their defensive skills and spells. These skills and spells were blasted to smithereens when the fireballs exploded after crashing into them.
More than half of the fireballs landed on the mobile fortress. Each explosion sent the mobile fortress staggering back. Its rune diagram flared brightly while its shield dimmed. Three of its eight legs broke. The people inside the mobile fortress fell to the floor while the entire fortress shook.