Yuna
Yuna is the summoner at the heart of the story and the first character to join Tidus when the party forms on Besaid Island. She serves as the party’s primary healer and is the only character who can summon Aeons.
| Overdrive: | Grand Summon |
| Celestial Weapon: |  Nirvana |
“A young, inexperienced summoner. Her father was the high summoner who defeated Sin ten years ago. She is learning to be a summoner at the island of Besaid.”
Sphere Grid Path
Yuna’s section of the Sphere Grid is focused on White Magic. She learns the full healing spell line, including 
Cure, Cura, and Curaga, and also learns revival spells like Life and Full-Life. Additionally, she learns important support spells like Esuna, Reflect, and Dispel and elemental protection spells such as NulBlaze, NulShock, NulTide, and NulFrost. Later in her path, she gains access to Holy, which is one of the strongest offensive spells in the game.
Her path connects naturally to Lulu’s Black Magic section, allowing her to pick up offensive spells once she finishes her own path, but it’s also a good idea to try and activate some of Lulu’s more powerful Black Mage spells, like 
Firaga, Thundaga, or Blizzara (or even Ultima and Flare), even earlier. Venturing over into Lulu’s Sphere Grid will allow her to use her high Magic stats to deal as much or more damage with these spells than Lulu can, effectively making her both a healer and a damage dealer.
Strengths
Yuna fills two critical roles that no other can fully replicate, which are her ability to heal and her ability to summon:
- She is the party’s primary healer. Curaga and Full-Life are essential for surviving tougher boss fights, and no other character has natural access to these spells early in the game.
- Her ability to summon Aeons gives the party access to powerful attacks and, more importantly, a way to absorb lethal hits. An Aeon can take a devastating attack that would otherwise wipe the party.
- Grand Summon, her Overdrive, lets her summon an Aeon with a full Overdrive gauge, enabling immediate use of powerful attacks like Bahamut’s “Mega Flare.”
- She has strong base Magic (20, tied with Lulu) and the highest base Magic Defense among the magic users (20).
- Holy, available later in her Sphere Grid path, deals massive non-elemental damage and is one of the best offensive spells in the endgame.
Limitations
Yuna has low base HP (475), low Strength (5), and low Defense (5), making her physically fragile. She should not be taking hits or dealing physical damage.
Her Aeons, while powerful during the main story, don’t scale well into the endgame. Against the toughest optional bosses, Aeons will be destroyed in one or two hits, and their damage output doesn’t keep pace with a fully built physical attacker. Her value in the endgame shifts toward healing, Holy, and using her Celestial Weapon’s auto-abilities.
Her Celestial Weapon, Nirvana, requires capturing all fiends in the Calm Lands for the Monster Arena and completing the Remiem Temple side quest, which is moderately difficult compared to some of the other Celestial Weapon challenges.
Grand Summon
Yuna’s Overdrive, Grand Summon, is not a traditional combat ability. Instead, it allows her to summon an Aeon with a full Overdrive gauge, letting it use its Overdrive immediately upon entering battle. If the Aeon already had a full Overdrive gauge, it could use two Overdrives back-to-back. Check out the Grand Summon page in the Overdrives section for more information.