Welcome to the Temple of Godcat! The first time you come here, there'll be a short dialogue between your characters.
On your first visit, you'll only be able to go through the lower path - head east to progress. When you reach the upper level, you'll be able to come back and grab the chest overhead - after that, head north to continue onward.
Spark Wraith: Two waves. (guards Chest #1)
Wave #1: Three Haunted Trees and two Spark Wraiths
Wave #2: Three Spark Wraiths and two Mad Cacti
Thunder Bird: Two waves. (guards Chest #2)
Wave #1: Three Thunder Birds and two Gold Fishes
Wave #2: Two Mage Birds, two Gold Fishes, and one Thunder Bird