Oracle of Ages & Oracle of Seasons
Game Boy Color
Oracle of Ages follows Twinrova's plot to light the Flame of Sorrow. Their minion, Veran uses her power of possession to take control of Nayru and disrupt the flow of time, causing great pain and sorrow in the land of Labrynna. Her actions lock two periods of time together and alter history. Her ultimate goal is to cause as much sorrow as she can, and increase her own powers by forcing the populace to construct a large tower without rest or mercy. Link must harness the Harp of Ages to control the flows of time and stop Veran from destroying Labrynna.
Oracle of Seasons follows Twinrova's plot to light the Flame of Destruction. Onox, their servant, plans to abduct Din and sink the Temple of Seasons to throw the seasons of Holodrum into total and complete chaos. Link must wield the Rod of Seasons and master the Essences of Nature to return Holodrum to regularity.
The main plot of the Oracle Series as a whole has Twinrova orchestrating an elaborate plot to revive Ganon using their minions they called from darkness, Veran and Onox, to light the Flame of Sorrow and the Flame of Destruction respectively, and the ultimate kidnapping of Princess Zelda, the world's symbol of hope, to light the Flame of Despair. They intend to use the three flames to revive Ganon . Their final move is to sacrifice Zelda to Ganon for him to use as a vessel. When Link saves Zelda, Twinrova decides to sacrifice themselves as vessels for Ganon. Because this is not the way the rites were intended to be done, the revival of Ganon instead results in a fairly mindless version of him that only seeks to destroy everything rather than rule over everyone. Link defeats Ganon, and, along with Princess Zelda, escapes the Room of Rites just before it collapses. This marks the true ending of the Oracle series.
-From Zelda Wiki