"Dive without breathing"
The Zora Ring is a Magical Ring that Link can obtain in Oracle of Seasons and Oracle of Ages. Link can acquire the ring by planting a Gasha Seed and finding it within a Gasha Nut. He can also acquire it in a Seed Ring form by bumping into Maple. The ring can also be obtained through a Fortune Link at Vasu's jewelry store.
When equipped, the Zora Ring will allow Link to dive underwater without breathing, thus allowing him to stay underwater indefinitely, without having to come up. Link can use this ring when encountering River Zora enemies. When Link dives underwater, he becomes invulnerable to the fireballs that the River Zora shoot out.