Temple of Light

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The Temple of Light is a location on the Island of Darkness. It is a large temple hidden atop one of the island's largest mountains, which can only be revealed with the use of a special medallion.

Its walls are covered with paintings of the Ninja's previous adventures, including them finding the Destiny's Bounty, creating their vehicles out of their golden weapons, facing the Great Devourer, and even them looking at the murals. In the center is the symbol of the Green Ninja with a bell above it, with the four Ninja's symbols surrounding it.

The Last Voyage
Misako revealed to the Ninja in a scroll that the gold in the Golden Weapons was from the Golden Peaks, but they were forged in the Temple of Light. Misako theorized that if the Ninja were to make it to the temple, they would be able to unlock their Elemental Blades. She then turned to Lloyd, proclaiming that if he could find the so-called "Instrument of Peace," he would unlock the power of the Golden Dragon.

Island of Darkness
After a long pursuit by the Stone Army, the Ninja finally managed to climb the mountain. As seen by Jay earlier, the Temple was shrouded in a light cloud. They opened the doors, only to find murals of them unlocking their vehicles, finding the Destiny's Bounty, and facing the Great Devourer. Cole even spotted a painting of them looking at the murals. As the Stone Army climbed, the Ninja found the circles that represented their elements. Lloyd realized shortly after that the bell above them was the Instrument of Peace his mother had spoken of previously. Upon striking it, he became surrounded by a white beam, which then reflected off of him, striking a crystal and lighting up pillars behind the others. As the light beams continually refracted, each Ninja was enveloped, gaining their new kimonos and blades. Lloyd rose in the air, and spun as he unlocked his power. Once the Ninja channel their power to him, he fell, equipped with his new kimono. With their new-found powers, the Ninja easily defeated the Stone Warriors surrounding them. Lloyd then summoned up the power of the Golden Dragon, which scared off the remainder of the army.

Rise of the Spinjitzu Master
As the Ninja climbed up the mountain after the Falcon alerted them, they realized the purpose of their Elemental Blades. Once the Ninja inserted each of their blades into individual sockets in the floor, they unlock the battle suit the First Spinjitzu Master used against the Overlord.

Trivia

 * Although the floor (and certain "panels") display the elemental insignias for each of the ninja, they appear to have no overall effect on both the Empowerment Ritual and unlocking the Golden Mech, as both times the ninja do not stand on their corresponding insignias.