Golden Sun (Nintendo Cinematic Universe)

Golden Sun is a Japanese anime series.

The Broken Seal
A group of Adepts are sent on a quest to protect Weyward from the destructive Alchemy.

The Broken Seal

 * Saturos and Menardi storm Mt. Aleph to seize the Elemental Stars for themselves, but fail to solve the riddles guarding the stars and are driven away by the mountain's trap, a magically generated thunderstorm and rock slide.
 * Three years later, Isaac, Garet, and Jenna join their teacher, Kraden, in his research of Mt. Aleph.
 * Their research coincides with a second raid of the sanctum by Saturos and Menardi, now assisted by Felix and Alex, who coerce Isaac into giving them three of the four stars.
 * The volcano erupts before they can retrieve the final star, but before escaping, Saturos and Menardi capture Jenna and Kraden as eventual bargaining chips.
 * The guardian of Mt. Aleph, the Wise One, instructs Isaac and Garet to prevent Saturos' group from casting the Elemental Stars into their respective Elemental Lighthouses across Weyard; if this happens, Alchemy will be restored and the period of instability will begin anew.
 * Isaac and Garet pursue Saturos' group to the Mercury Lighthouse, joined by Ivan.
 * Despite their best efforts, they fail to prevent Saturos from activating Mercury Lighthouse with the Mercury Star.
 * Saturos' group leaves for the next Lighthouse with Isaac's party remaining in pursuit.
 * In the ensuing chase, Isaac learns that Saturos has taken another Adept hostage: the female Jupiter Adept, Sheba.
 * Saturos and Menardi activate the Venus Lighthouse with the Venus Star, and are confronted by Isaac's party immediately thereafter.
 * Attempting to annihilate their opponents, Saturos and Menardi magically merge to form a massive two-headed dragon, but Isaac's party slay Saturos and Menardi and rescue Sheba.
 * The remnants of Saturos' group, headed by Felix and Alex, continue their quest to light the remaining two Lighthouses, with Jenna, Sheba, and Kraden still with them.
 * Isaac's party boards a ship and sail out into Weyard's open seas to continue their mission.

The Broken Seal

 * Based on Golden Sun.