Enormus War

Ben's vision was filled with white, followed by a strong sound. He saw a lightning attack passing just above his head. This attack was far from normal; as it hit a monster, it bounced and hit another and continued to do so like a chain reaction. 

In milliseconds, Ben saw thousands of advanced class monsters caught in the chain reaction. Continuously electrocuted by the attack, they began to burst into a cloud of smoke, leaving a crystal behind. 

"How come someone killed an advanced-tier beast in one shot?" Ben asked in surprise. He turned to look at the spellcaster, but the caster was way too fast; it had already disappeared from his earlier position. 

'This gives me time!' Ben thought, and he instantly lit a few incense sticks and activated another piece of equipment. Although this equipment was made for Ben to not be detected by dungeon monsters, this still wouldn't stop him from being caught up in the crossfire.