Corona

Corona (フィーバ Fever) is a Mars Djinni found throughout the Golden Sun series.

Corona is the third Mars Djinni in the original Golden Sun, and can also be acquired in Golden Sun: The Lost Age. Although it is not the party's third Mars Djinni in The Lost Age, Corona is still ordered as the third Mars Djinni when equipped to characters. Because it is not available until after most other Mars Djinn can be found, however, the separate Djinn list viewable with the Select button from the status screen lists Corona and all other Mars Djinn from Golden Sun after all of the Djinn introduced in The Lost Age. According to this order, Corona is the fourteenth Mars Djinni in The Lost Age rather than the third, but this order has no influence elsewhere in the game.

In Dark Dawn, Corona appears as one of the "extra Djinn" in the Djinn Guide because of its temporary appearance in the earliest stage of the game.

Basic description
When Set, Corona increases its Adept's base HP by 12, base Psynergy Points by 3, base Defense by 3, and base Luck by 1.

When Corona is unleashed in battle, all currently active and alive Adepts get buffed with a 25% temporary increase to their respective defense ratings. This is twice as strong as Protect/Protector. All defense-boosting effects come in the form of 12.5% "stages", so therefore Corona boosts each Adept's defense rating by two stages, and the maximum amount of stages an Adept's defense can be boosted to is four, at +50%.

In Golden Sun and The Lost Age, Corona's unleash animation visually resembles the user summoning a glowing, transparent image of a Mars Djinni that briefly hovers above the party, as each Adept affected by the effect has a swirling array of white-red energy orbs gather into them, and a shield image briefly flashes at each Adept's position to indicate a defense boost. In Dark Dawn, the 3D model of Corona is summoned in a flash of light, who floats above the party briefly as each party member is surrounded by a small amount of fire briefly, followed by a small, round yellow field that enters into each Adept from the legs up.

Locations
Golden Sun: Corona is the first Djinni players can come across in Golden Sun that is randomly encountered in a specific area of the overworld that otherwise appears to be pointless scenery. Thus, it is almost always missed by players playing the game the first time without any outside information. The battle with Corona may ensue in place of a random battle at the end of a vertical stretch of land parallel to the Mogall Forest region in Angara, in the pictured "island" north of Xian, and Corona then, of course, must be battled to be acquired. See here for enemy statistics.

Golden Sun: The Lost Age: Players can transfer data from Golden Sun to The Lost Age, but even if they don't, Corona will be among the Djinn Isaac's party has with them when they join forces with Felix's party late in the game.

Golden Sun: Dark Dawn: Corona is one of the five Djinn that Isaac and Garet keep to themselves and exclusively use while in Tanglewood, meaning that the player can only see Corona being used while exploring Tanglewood, the Abandoned Mine beyond that, and the Tangle Bloom boss fight at the end. After this, Corona and the other Djinn are not seen for the rest of the game.

Analysis
General: The mass-defense-boosting effect that Corona and other identical Djinn provide is a highly effective buffing effect in any of the games because many enemies' attacks are physically based and will be lowered a large amount, justifying the turn an Adept takes to cast it. However, the additional defense works bests against enemies without many offensive Psynergy or monster skills that are based on elemental power rather than elemental physical attacks.

By game
Golden Sun: Corona is the one Djinni that is Protect doubled in effectiveness, and can be a very valuable battle effect to players who incorporate buffing all party members' physical defense ratings in their battling approaches. When the game is played with all Adepts in their respective mono-elemental class series, both the Guard Psynergy series and this Djinni are present on Garet, so it could be said that this is a superior option for Garet to make use of if you have that choice. Technically, this Djinni only gets better as the game progresses and party members' defense ratings increase. Note that defense-buffing effects like these stack with each other up until all Adepts have +50% defense rating modifiers.

Golden Sun: The Lost Age: When Isaac's party joins Felix's party along with their returning Djinn, Corona's ability makes it a second Iron, a Venus Djinni with the exact same effect that the TLA party finds very early on in that game, and these two together are the only Djinn whose effects are two Protects worth of attack buffing at once. Whether you find it useful for Adepts, with or without Protect, to have one or both of these Djinn Set onto them ready for them to use is entirely up to you and whatever battling approach you deem worthy, though.

Golden Sun: Dark Dawn: Corona's appearance in Garet's possession at the beginning of the game is trivial at best, because there is no threat from the attacks of enemies or the Tangle Bloom boss encounter from the end, with or without a defense boost. The only real use of it is that once Garet happens to use it, that will count as an extra Mars Djinni On Standby for a summon like Tiamat or Meteor, which will make the Tangle Bloom fight pass by quickly. In the main game, the Venus Djinn Brick and Buckle are identical equivalents.

=Name Origin= A corona is the high-altitude gaseous envelope of the sun that can be seen during a solar eclipse as the golden ring around the blocked out sun. A fever is a symptom where the body's internal temperature rises above normal. Note that the English translation of the games switched the names of Corona and Fever.