Ragnarok and Odyssey

Ragnarok and Odyssey are related Venus-element Physical Attack Psynergies featured throughout the Golden Sun series. It is exclusive to the Squire class series, and therefore exclusive to the central Venus Adepts of each game.

Ragnarok
Ragnarok: "Strike with a massive sword.": This spell costs 7 Psynergy Points. The user strikes a single enemy target with an attack equal to his normal physical attack with 35 points of damage added to the result, and then the result is modified based on how the user's Venus power measures up against the target's Venus resistance. Visually, the user summons a large, orange-glowing, vaguely transparent image of a sword that shoots down from the sky and crashes into the position of the target, exploding into bright-orange energy orbs that fill the screen.

In Golden Sun, all stages of the Squire Class series knows Ragnarok starting at level 13, including the Lord class, so Isaac has access to this Psynergy when Venus Djinn are the only element of Djinn that are Set onto him. However, in The Lost Age, Ragnarok is replaced by Odyssey in both the Lord Class and the Slayer class, so Isaac and Felix will know Ragnarok when Venus Djinn are the only element of Djinn that are Set onto them, and no more than 5 Venus Djinn are Set.

Ragnarok's damage output is roughly the same as other elemental physical attack Psynergies like Planet Diver, but in practice this appears to do more damage than the likes of Heat Wave and Diamond Dust because Isaac and Felix's attack ratings climb higher more easily with levels and weapons. It is essentially a Psynergy-costing method of producing an attack that is roughly the power of a mid-game Unleash. It is most useful the earlier it is acquired because of how it includes a 35 damage bonus, making it good against Saturos at Mercury Lighthouse in Golden Sun and Briggs in The Lost Age. By the end of Golden Sun, though, it has to compete with Isaac's chance to unleash Gaia Blade, which adds 70 damage each time. While stronger, Isaac only has a chance to Unleash every time he uses what would otherwise be a normal physical attack, so Ragnarok has an advantage in being a reliable damage-boosting method.

Odyssey
Odyssey: "Pierce a foe with a colossal sword.": This spell costs 18 Psynergy Points. The user strikes a single enemy target with an attack equal to his normal physical attack with 95 points of damage added to the result, and then the result is modified based on how the user's Venus power measures up against the target's Venus resistance. Visually, the user and the target are brought into a dark blue realm, where the user proceeds to summon two small white swords that pierce through the target at diagonal angles from the right, and then bolts forward as a colossal yellow image of a sword pierces through the target from the right, shattering the two smaller swords and turning the screen white.

In The Lost Age, the last two stages of the Squire Class series, Lord and Slayer, know Odyssey starting at level 13, so Felix and Isaac have access to this Psynergy when Venus Djinn are the only element of Djinn that are Set onto them, and they have at least six Venus Djinn Set.

While powerful and reliable as an option for a Venus Adept to use late in the game, it is expensive to use, especially considering that the Squire class series has almost the lowest PP rating. It would be a good option for Isaac to use for a while if he is equipped with the Gaia Blade and is in the Lord class when he joins the party late in The Lost Age; Odyssey can be relied on as a stronger version of the Gaia Blade's Unleash that one can trigger when they need it, at the expense of a lot of PP. Because enough Djinn can be found in the Great Eastern Sea that Felix can be in the Lord class prior to entering Lemuria, he can use Odyssey as early as the boss fights with the Avimander and Poseidon. Those, along with other boss fights such as Moapa and the two Knights, are among the best places to use Odyssey in. By the end of the game, though, its use may falter - a Venus Adept equipped with the Sol Blade should focus on unleashing the extremely powerful Megiddo instead, so only the other Venus Adept may still find use for it, and that depends on whether he is not equipped with a weapon like Excalibur or Tisiphone Edge - weapons with Unleashes that have a chance to be even stronger than Megiddo.

Ragnarok
Ragnarok: "Strike with a massive sword.": This spell costs 7 Psynergy Points. The user strikes a single enemy target with an attack equal to his normal physical attack with 35 points of damage added to the result, and then the result is modified based on how the user's Venus power measures up against the target's Venus resistance. Visually, the user summons a large, orange-glowing sword that shoots down from the sky and implants itself into the ground at the enemy's feet diagonally, creating a small fissure in the ground. It remains embedded in the ground as bright-orange energy orbs are loosed from the fissure, and after a moment the screen turns white.

In Dark Dawn, the first three stages of the Squire Class series knows Ragnarok starting at level 13, including the including the Squire, Knight, and Gallant classes, so Matthew has access to this Psynergy when Venus Djinn are the only element of Djinn that are Set onto him. Ragnarok is replaced by Odyssey once Matthew attains the Lord class (which requires him to have at least six Venus Djinn Set on him).

Matthew's high attack rating makes Ragnarok seem stronger than Tyrell's Heat Wave or Amiti's Diamond Dust. It is useful the earlier it is acquired because of how it includes a 35 damage bonus, making it good against bosses in the Ei-Jei region.

Odyssey
Odyssey: "Pierce a foe with a colossal sword.": This spell costs 18 Psynergy Points. The user strikes a single enemy target with an attack equal to his normal physical attack with 95 points of damage added to the result, and then the result is modified based on how the user's Venus power measures up against the target's Venus resistance. Visually, the user and the target are brought into a dark blue realm, where the user proceeds to summon four small yellow swords that pierce through the target at diagonal angles from underneath. Then, the user jumps into the air and makes a sword-swinging motion, and a colossal orange sword then pierces through the target from above, shattering the four smaller swords and turning itself white before the screen is turned white.

In Dark Dawn, the last two stages of the Squire Class series, Lord and Slayer, know Odyssey starting at level 13, so Matthew has access to this Psynergy when Venus Djinn are the only element of Djinn that are Set onto them, and he has at least six Venus Djinn Set.

Being an attack that one can rely on to deal a very large amount of straight bonus damage makes Odyssey all the more valuable in Dark Dawn because of the changes to the Unleash system that makes scoring strong hits with Unleashes a more randomized process. The expensive PP cost remains a factor, however. As the Lord Class can be attained mid-game around the Morgal region, Odyssey should prove useful in the boss fights against Sludge and the Mountain Roc. Late in the game, Odyssey may end up no longer used because there are various opportunities for Matthew to score higher damage with an effect that applies a multiplier to the damage dealt, such as many Unleashes. Odyssey will be obsoleted once Matthew obtains and equips the Sol Blade, which has potential for enormous Unleashing power.

Cultural references
Ragnarok is the name given in Norse myth to the battle that will ultimately cause the end of the current world and the creation of the new. The Psynergy was likely given this name simply to exemplify its violent nature.

Odyssey is the name of an epic poem by Homer, deriving its name from its hero, Odysseus (Ulysses in Roman sources).