The Secret of the Crystals

The Secret of the Crystals is the main story arc of Adventures of the Mushroom Kingdom. It follows Mario, Luigi, Bowser Junior, and the rest as they discover two magic wands powered by ancient crystals, two wizards in a long rivalry, and the growing threat a evil dark force that is trapped in a prison.

Episodes
These are the episodes that are in The Secret of the Crystals story arc:

The Wizard Battle

The Emeralds of Kablooey

Out of This World

Easter

Doomsday

Crystal Search

The Story

Battle for the Crystal

Characters, Items, and History
The story arc features two important items: a gold magic wand and a red magic wand. The gold magic wand is powered by the Red Crystal of Good, while the red magic wand is powered by the Red Crystal of Evil. Two wizards usually wield these magic wands: Kodlay, the Wizard of Good, and Thoexys, the Wizard of Evil.

There also is another crystal: the Turquoise Crystal of Balance, which serves as the balance between light and darkness. It is currently owned by Princess Peach as her amulet.

When the two red crystals are united, using a emerald from the planet of Kablooey, they can be forged into a purple crystal that holds extraordinary power. However, the purple crystal can be turned back into the two red crystals.

Two important characters are Gyn and Myn. Gyn is the primordial being of light, who created the Mushroom World and the Toads. Myn is the primordial being of darkness, who created the monsters and evil in the Mushroom World. Gyn created the two red crystals and the turquoise crystal. Myn and Gyn fought each other in the Battle of Mivian, where the original Mushroom Kingdom was located. Gyn was able to seal Myn away in a void of nothingness. Unfortunately, Gyn disappeared soon after.

Thoexys is trying to find a way to free Myn and bring about the end of the world. Kodlay, Mario, Bowser Junior, and the others try to stop him from completing his mission.

The story arc is currently ongoing, so more of the story is yet to come.