Chrono Trigger Ending Collection (Ending 6 - Frog's Oath)

This ending starts out in Lucca's home, where she is repairing Robo. Frog abruptly leaves, heading toward Magus' castle. Frog fights through Slash, Flea, and Ozzie before confronting Magus. Magus and Frog fight throughout the credits, and Frog emerges victorious, standing on top of the castle by moonlight at the end.

Conditions:
Beat Lavos as soon as the Masamune is repaired and Frog joins you.