The Tower of Druaga: The Aegis of Uruk S01 E09 Eleven Nine

Jil and his party enter an area supported only by thin pillars. They engage in a battle against a balloon-shaped monster called Barbar and, demonstrating well-coordinated team play, they defeat the enemy in the end, thanks to Melt's magical tricks. The festive mood from the victory, however, is short-lived as the feebly structured area collapses due to the explosion caused by Barbar's demise. The collapse of the area also extends to other areas on the same floor, thus causing Neeba's party and the Uruk Army much chaos. In the end, members of all parties find themselves separated from each other.