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 Lost Age
A re-telling of The Broken Seal with Felix in the lead role.

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 Lost Age

 * Two of the four Elememntal Lighthouses have already been activated.
 * Jenna, Felix's younger sister, has joined her brother to complete Saturos and Menardi's original mission, along with Sheba and Kraden.
 * Felix is finally able to explain to Isaac why Alchemy's release is a necessary thing for everyone, and that Saturos and Menardi were aiming for this goal merely for the sake of the survival of their home colony of Prox to the far north, located near the Mars Lighthouse.
 * He also reveals that his parents and Isaac's father are alive and currently being held hostage in Prox in order to coerce Felix's initial cooperation.
 * Isaac and his company agree to aid Felix, and the group sets out north to activate the Mars Lighthouse.
 * The group discovers that Karst and Agatio have been transformed into mindless dragons and are forced to defeat them - they return the Mars Star before succumbing to their wounds.
 * When they reach the tower's top, the Wise One, the entity responsible for originally tasking Isaac to prevent the breaking of Alchemy's seal, confronts them. He warns them that mankind could very well destroy Weyard themselves if they had possession of such a power, and when Isaac insists on breaking the seal regardless the Wise One summons a giant, three-headed dragon for the party to battle in the final struggle.
 * After slaying the dragon, the party of Adepts finish their objective and activate Mars Lighthouse; with all four towers across Weyard lit, the process that heralds the return of the force of Alchemy to Weyard ensues at the mountain sanctum Mt. Aleph.
 * Alex is there, however; he took advantage of everyone else's quests so that he would gain immense power for himself from the light of the Golden Sun, a manifestation of Alchemy itself.
 * However, Alex discovers that the Wise One had taken steps to prevent this and is left to die as the mountain sinks into the earth.

The Broken Seal

 * Based on Golden Sun.

The Lost Age

 * Based on Golden Sun: The Lost Age.