- This article is about the element. For the Summon sequence, see Mercury (summon).
The element of Mercury is represented by fish, who are said to rule the seas. Mercury-based Psynergy typically invokes water and/or ice in offensive attacks. The Belinsk Ruins invoke the power of Mercury by means of the Douse Psynergy, required for certain puzzles. Most offensive Mercury Psynergies are Power-based, with the Cutting Edge series and the Diamond Dust series making up the only Attack-based offenses. The Mercury element has many Utility Psynergies associated with it, including the Douse, Frost, Cold Snap, Cloak, Lift, and Parch.
One major aspect of the Mercury element is its healing capabilities. While all four elements contain healing aspects, Mercury-based heals are generally the strongest, with the Ply Psynergy series being the strongest single-target heal, and the Wish Psynergy series being the strongest mass-healing move. Also including in the healing arsenal is Cure Poison and Restore, moves that allow players to remove almost any status condition.
In a few instances throughout the series, Mercury's relationship with the other elements is demonstrated or implied. In Golden Sun, the release of Mercury Psynergy from Mercury Lighthouse is specifically stated to have weakened the Mars Adept, Saturos, to the point that Isaac's party was able to defeat him in battle. Mars's weakness against Mercury would lead Karst and Agatio to target the Mercury Adept Mia, in an attempt to prevent her from being able to use her Psynergy against them. However, Mercury's more symbiotic relationship with Jupiter is more implied than stated outright. In The Lost Age, it is theorized that the combined power of Mercury and Jupiter is what caused temperatures worldwide to plunge.
Adepts of the Mercury Element
Nearly all known Mercury Adepts come from either Imil or Lemuria. Mercury Adepts from Imil are descendents of the Mercury Clan, a clan charged with watching over Mercury Lighthouse, which serves as the source of their powers. The power source for Lemurian Mercury Adepts is unknown, though nearly all of the populace possesses Mercury-based powers. By the time of Dark Dawn, at least one other Mercury Adept, Amiti, exists in Ayuthay; it is mentioned that he inherited his powers from his father, a powerful, but unknown Mercury Adept. Aqua Rock is also a source of Mercury-based Psynergy, but unlike the other three rocks, it appears to have little influence on the nearest community, as there are no demonstrated Mercury Adepts in the Apojii Islands.
In line with the elements capabilities, Mercury Adepts that join the player's party possess powerful healing Psynergy. In fact, Mia is known in Imil for her healing capabilities. However, there are those, such as Piers and Amiti, who forego learning the more advanced recuperative abilities for more offense-oriented Psynergies. One coincidental aspect of Mercury Adepts is that the vast majority of known Mercury Adepts possess blue hair. It is also interesting to note that all playable Mercury Adepts have a small lock of hair that stands up. Alex has this distinction as well.