Final Fantasy V
Story
The party discovers the crystals make their planet habitable and also seal away Exdeath, an evil sorcerer. The party attempts to save the crystals of Water, Fire, and Earth. Each time, they fail but gain new powers from the crystals' shards. Having been freed, Exdeath defeats the party and returns to his homeworld. King Tycoon, who was controlled by Exdeath to destroy the last crystal, sacrifices himself to save the others.
Story
For a time, it seems Exdeath has been truly destroyed, and the party celebrates in Tycoon. However, a thorn leaps from Krile's palm, manifesting as Exdeath, now resurrected and fully in command of the Void. With it, he removes entire towns and kingdoms from existence, tossing them into an interdimensional rift.
Story
The reunification of worlds has opened the pathways to ancient sites where powerful artifacts are hidden. So armed, the party enters the rift. With help from a reformed Gilgamesh, they find Exdeath at the center of the rift seeking the power of the Void. They fight Exdeath, first in his demonic tree form, and then after he transforms into Neo Exdeath, intent on destroying all reality, including himself. The heroes defeat Exdeath and use the crystal shards' power to seal the Void once more and restore the reunified world and its crystals.