Showdown! The Magic Knights Versus Zagato - S1.E19

The girls start to head towards the flying mountain in the sky, and remembers the good times, and bad times they had. They then get a message from Princess Emeraude, telling them to grant her wish and save Cepiro.

They finally reach the place, only to find Zagato in his own Machine preventing them to come any further. They fight, they get injured, and when it looks like they don't win, they combine all of their powers, Red Lighting, Dragon Water, and Green Gale. They shoot it towards Zagato, where it kills him.

In the final scene Princess Emeraude screams in horor as Zagato is killed off.