The Forbidden Dance? Where is the Strongest Spell?

Lina pays for a map, saying that their is treasure in an anceint ruin that may or may not contain the real Claire Bible. They reached the ruin only to find two other groups are also looking for this ""treasure"", and a silly looking monster, guarding the ruins. Lina manages to slow the two groups down as the monster goes for both parties. Leaving Lina and company alone as they enter the ruin. It has several stupid obstacles at first (When Lina tells them if you see a button... Gourry pushes it, only to find out you're not suppose to push it, etc.) but they reach a room containing a treaure like chest. They look at the contents of the chest, only to find out that it contains a book and two dresses that are needed to perform the spells in the book. The silly monster attack them, while the other groups show up. The all of them (except Lina, Amelia and Zelgadis) fight each other. Lina and Amelia stop the fight as they put on the dresses, and proceeds to do sing the 'spells' in the book (a