Zack slowed down on the third floor because XP Multiplier got in its cooldown state, and he couldn't afford to waste the chance of leveling up in those situations. Not when he was so close to reaching level three hundred already.
After those five minutes, he began to move again as fast as he could. Maybe it was a coincidence, but when he found the boss on the third floor, he saw that it was a metallic golem.
"Are they trying to make it harder for melee fighters?" Zack thought.
It made sense since Zack had only shown physical skills until now. Regardless, towering before him stood a metallic golem, a colossal figure reaching ten meters in height. Its entire body gleamed with a striking blue hue, reflecting the dim light that was inside the dungeon.