Armos-Ritter in Ost-Palast

Six Armos Knights guard the Pendant of Courage. Destroy five knights with shots from your Bow. Once you've whittled the Armor Knights down to one, the remaining foe will turn red and attempt to stomp you out of existence. Defeat it to receive a Heart Container and the pendant. Take the pendant to Sahasrahla at his hiding place.

Eliminating five of the Armor Knights is relatively easy, if you have enough arrows and can stay out of their way. The final one's much harder—it hovers in the air, homes in on your position then drops to the floor. Leap out of the way, then strike it.