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.

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.

As an opponent (Golden Sun)
Statistically, Corona has 355 HP, 24 PP, 144 Attack, 41  Defense, 76 Agility, and 8 Luck. Like all other Mars Djinn that are fought, in terms of resistance, it has a Mars Resistance rating  of 193, Venus and Jupiter Resistance ratings of 100 each, and a Mercury  Resistance rating of 25, and in regards to its abilities it uses its  available Mars-based attacks with a Mars power rating of 125.

Corona can use the following battle commands:
 * Flare Wall: Used 53 out of 256 times, this is a Psynergy spell that  causes two patches of fire stacked on top of each other to go through  multiple Adepts and deal a Mars-based attack with a power rating of 40  and a range of 3. This ability consumes 7 of its user's PP.
 * Volcano: Used 47 out of 256 times, this is a Psynergy spell that causes a fiery  pillar to explode at the targeted Adept's position, dealing a Mars-based  attack with a power rating of 45. This ability consumes 6 of its user's  PP.
 * Mad Blast: Used 41 out of 256 times, this is a Psynergy spell that causes a moderately large explosion of vaguely  liquid-ish fire to combust at the enemy's general position, dealing a  Mars-based attack with a power rating of 50 and a range of 3. This  ability consumes 9 of its user's PP.
 * Attack: Used 40 out of 256 times, this is this monster's standard physical attack, but for this monster it is counted as a  Mars-based attack rather than a non-elemental attack.
 * Fireball: Used 35 out of 256 times, this is a Psynergy spell that projects a  moderately large amount of fiery spheres that arc over and into the  party's position, dealing a Mars-based attack with a power rating of 65  and a range of 5. This ability consumes 12 of its user's PP.
 * Nova: Used 29 out of 256 times, this is a Psynergy spell that causes a large  explosion of fire to discharge at the party's position, dealing a  Mars-based attack with a power rating of 70 and a range of 5. This  ability consumes 13 of its user's PP.
 * Flee: Used 11 out of 256 times, this enemy has the ability to attempt to Flee  the battle, thereby ending the battle if successful without rewarding  you with the associated EXP, Coins, and the Djinni itself. Since this is  a randomly battled overworld Djinni, however, it can be very quickly  fought again just by running around in the same area you first fought it  in.

When defeated, Corona yields 173 EXP and 210 Coins, and the Corona Djinni is added to your  party's Djinn collection. If you fell it with an offensive Mercury Djinni like Sleet, its rewards increase to 224 EXP and 273 Coins.

When the game is played perfectly, you have three of each other element of  Djinni by this point, so you should by all means try to destroy Corona  in one turn with Cybele, Procne, and Neptune, the last of  which should deal over 200 damage in one hit. Even if not, Corona's chance to flee is lower than other Djinn that are fought to be earned.

Analysis
General: The mass-defense-boosting effect that Corona and other Djinn are highly effective buffing effects 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'  attack 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.

=Name Origin= A corona is the high-altitude gaseous envelope of the sun that we can see 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.