Kandorean Temple

From Golden Sun - Wiki on Neoseeker

Kandorean Temple is the first actual dungeon you will enter in Golden Sun: The Lost Age. It also holds your first boss, the Chestbeaters.

The entire idea for the Temple is for you to make your way through a test of endurance, dodging traps and puzzles to get to the end where the temple head monk will give you the item that teachers you the psynergy Lash. This psynergy will give you the ability to take a rope and extend it to the nearest pole where it's able to tie to.