Doom Dragon

The Doom Dragon is the final boss in Golden Sun: The Lost Age. While powerful and very durable, it is outdone by Dullahan in sheer ferocity.

As a boss
Doom Dragon is the only enemy to have three appearances in the same battle; it is essentially three enemies, fought one right after the other. The three forms taken together gives the Doom Dragon a grand total of 13,200 HP. In terms of resistance, all three forms have a Venus Resistance rating of 195, a Mars Resistance rating of 175, a Mercury Resistance rating of 130, and a Jupiter Resistance rating of 98, and in regards to their abilities they uses their available Venus-based attacks with a power rating of 110 and their available Mars-based attacks with a power rating of 105.

First stage (Three heads)
The first stage of the Doom Dragon battle features 5000 HP, and the dragon can act four times per turn. It uses the following battle commands:


 * Blast Breath: This is a monster skill where the dragon blows out a large, searing beam of white-hot energy through the Adepts, dealing a Mars-based attack with a power rating of 170 and a range of 3 (the adepts to either side of the targeted Adept will only take 50% of the attack's force, instead of the normal 80%, however). In addition, each affected Adept's Defense rating may be lowered by 12.5%. This can be considered the strongest attack this first form of Doom Dragon has.
 * Cure: This is a Psynergy spell that restores roughly 70 HP to the user, consuming 3 of its user’s PP.
 * Curse: This is a Psynergy spell that briefly generates a candle icon at the target Adept's position, and the target has a chance to get inflicted with a 7-turn Death Curse status ailment. This ability consumes 6 of the monster's PP. Considering this is a many-turn boss battle, Curse may end up downing an Adept not properly tended to.
 * Defend: This monster has the ability to cut all damage it would take this turn in half, regardless of how fast the party acts.
 * Djinn Blast: A unique monster skill that erupts a mass of multicolored energy around a targeted Adept, putting into Recovery mode all of the Djinn on that party member. A very negative effect indeed, often prompting players to switch out the drained Adept with another reserve Adept and wait out the many turns necessary for at least the majority of the Djinn on that Adept to Set themselves back.
 * Earth Force: This is a monster skill where the dragon blows out a large. purple, electrically-charged sphere representing a high-gravity field, and the sphere slowly approaches a targeted Adept and instantly disappears upon contact, knocking the Adept far back off the screen. When the effect actually connects, it renders the Adept unable to move for one turn; it is likely that it will not have any effect at all, however.
 * Earthquake: This is a Psynergy spell that launches multiple Adepts into the air twice each, dealing a Venus-based attack with a power rating of 35 and a range of 5. This ability consumes 7 of its user's PP. Note that this form of Doom Dragon also has access to the upgraded Quake Sphere Psynergy.
 * Fiery Blast: This is a Psynergy spell that creates a moderately large explosion, dealing a Mars-based attack with a power rating of 110 and a range of 5. It consumes 19 of its user's PP.
 * Flare Storm: This is a Psynergy spell that generates a 3-stacked mass of fire that goes through multiple Adepts, dealing a Mars-based attack with a power rating of 80 and a range of 3. This ability consumes 12 of its user's PP.
 * Gravel Blow: This is a monster skill where the dragon breaths what appears to be a shower of solid brown rocks at the Adepts, dealing a Venus-based attack with a power rating of 90 and a range of 3 (the adepts to either side of the targeted Adept will only take 50% of the attack's force, instead of the normal 80%, however).
 * Haunt: This is a Psynergy spell that causes a mass of purple skull symbols to swirl into each party member, and each affected party member has a chance to get inflicted with the Haunt status ailment. This ability consumes 5 of the monster's PP and has a range of 3.
 * Psy Boost: This is a monster skill where the user briefly absorbs white energy, and will restore roughly 20PP.
 * Quake Sphere: This is a Psynergy spell that launches multiple Adepts into the air three times each, dealing a Venus-based attack with a power rating of 65 and a range of 7. This ability consumes 15 of its user's PP.
 * Thorn: This is a Psynergy Spell that generates a small mass of thorny spiked vines at the position of the party of Adepts, dealing a Venus-based attack with a power rating of 35 and a range of 3. It costs the user 6 PP.

In addition, there will be many times when at least one of the boss' four moves will be nothing, and the battle text will read "Doom Dragon can't move!"

Second Stage (Two heads)
The second stage of the Doom Dragon battle features 4200 HP, and the dragon can act three times per turn. With each action it may perform one of the following battle commands:


 * Blast Breath: Carried over from the first stage, this continues to be a rather strong multi-target Mars attack the Doom Dragon may use freely, lowering each affected target's Defense at times.
 * Briar: This is a Psynergy Spell that generates a mass of thorny spiked vines at the position of the party of Adepts, dealing a Venus-based attack with a power rating of 70 and a range of 3. It costs the user 11 PP.
 * Clay Spire: This is a Psynergy spell that causes three thick stalactites to fall from the sky onto the Adepts and shatter on impact, dealing a Venus-based attack with a power rating of 85 and a range of 3. It costs the user 13 PP.
 * Cruel Ruin: Arguably the ability Doom Dragon is infamous for. This monster skill is a Summon sequence-style effect displaying an elaborate sequence of apocalyptic imagery that ends with the entire party being consumed within a titanic beam of destructive energy. It is a Venus-based summon sequence with a base power rating of 200, and the game treats the ability as though the Doom Dragon has many of its own "Venus Djinn On Standby", causing the additional and substantial damage that scales up based on how much maximum HP each target has that is associated with summon sequences in general. This is why Cruel Ruin does more damage to a higher-leveled party than a lower-leveled one, but regardless of the party's levels the damage output is colossal. Doom Dragon can use this freely, and rather often as well. This is the single ability that thoroughly damages and even wipes out inadequately prepared parties, so Psynergy like Cool Aura and Pure Wish, guarding Djinn like Flash and Shade, and maybe even the regenerating summon Coatlicue are imperative.
 * Curse: Carried over from the first stage, this continues to be a "minor" effect that takes a long time to work, but because this final boss battle takes a lot of turns to begin with, Curse may end up downing an Adept not properly tended to.
 * Desert Gasp: This is a monster skill where the dragon breathes out a stream of grainy sand at the party, dealing a Venus-based attack with a power rating of 45 and a range of 3 (the Adepts to either side of the targeted Adept will only take 50% of the attack's force, instead of the normal 80%, however). In addition, each affected Adept's Defense rating may be lowered by 12.5%.
 * Djinn Blast: Carried over from the first stage, this continues to cause the occasional party member to be severely weakened for a good period of time. An Adept that has been afflicted with this will be much more likely to be wiped out if Doom Dragon uses Cruel Ruin.
 * Earth Force: Carried over from the first stage, this continues to be an ability that rarely works its intended stun effect, and thus is something one might start hoping to see more of in place of other damaging abilities.
 * Guard Aura: This is a monster skill where the dragon is veiled by a translucent wall of energy, cutting down all damage it would incur this turn down to a mere 5% - it is practically invulnerable, and this move always acts first during a given turn regardless of the party's speed. Part of what makes Doom Dragon much tougher to take down later on in the fight.
 * Haunt: Carried over from the first stage, this continues to be a relatively "harmless" effect which only has a chance to inflict some Adepts with an effect that has a chance to cause them damage whenever they act.
 * Inferno: This is a Psynergy spell that causes a mass of balls of fire to spread out from the user and home in to each of the Adepts, dealing a Mars-based attack with a power rating of 140 and a range of 5. It costs the user 23 PP.
 * Serpent Fume: This is a Psynergy spell that shoots out a large serpentine entity of flame from the user that widely arcs over to crash into a targeted Adept in an explosion, dealing a Mars-based attack with a power rating of 130. It costs the user 14 PP.
 * Spire: This is a Psynergy spell that causes a thick stalactite to fall from the sky onto a targeted Adept and shatter on impact, dealing a Venus-based attack with a power rating of 40. It costs the user 5 PP. Note that Doom Dragon in this form also has access to the upgraded Clay Spire Psynergy.

Third Stage (One head)
The third stage of the Doom Dragon battle features 4000 HP, and the dragon can now only act two times times per turn, and the physical number of moves in the Doom Dragon’s inventory is now lower than before. In spite of this, the Doom Dragon becomes immensely more dangerous than even its second stage, because with each action it may perform one of the following battle commands:


 * Cruel Ruin: Carried over from its second form, Cruel Ruin continues to be a massively damaging, party-member-downing summon-style spell that gets parties scrambling to heal themselves in short amounts of time. It is even more often used in the third stage of the battle than in the second, and coupled with the Djinn Storm ability this attack makes the Doom Dragon very hard to survive.
 * Darksol Gasp: This is a monster skill where the dragon blows out a mass of dark energy against the party, dealing a Venus-based attack with a power rating of 230 and a range of 3 (the adepts to either side of the targeted Adept will only take 50% of the attack's force, instead of the normal 80%, however). In addition, each affected Adept may be inflicted with Haunt.
 * Djinn Storm: The upgrade of Djinn Blast, this unique monster skill is most likely the single most crippling and dangerous effect in the Golden Sun series. A screen-filling mass of multicolored energy erupts around the entire party, putting into Recovery mode all of the Djinn on all currently battling party members. This makes the entire party much weaker for quite a few turns, and a lot more susceptible to attacks, especially from the likes of Cruel Ruin. It is entirely possible for Doom Dragon to first use Djinn Storm and then Cruel Ruin as its two actions in a given turn; this offense is so powerful and so likely to down even Adepts at full HP that inadequately prepared players are very likely to lose the battle at this stage.
 * Earth Force: Carried over from the both of the previous stages, this monster skill continues to feel mercifully "useless", rarely causing its intended effect of Stunning a targeted Adept. This is an ability the player hopes Doom Dragon uses at this point.
 * Guard Aura: Carried over from the second form, this monster skill continues to render the Doom Dragon nigh-invincible for the occasional turn.
 * Nettle: This is a Psynergy Spell that generates a large mass of thorny spiked vines at the position of the party of Adepts, dealing a Venus-based attack with a power rating of 140 and a range of 5. It costs the user 23 PP.
 * Stone Spire: This is a Psynergy spell that causes five large and thick stalactites to fall from the sky onto the Adepts and shatter on impact, dealing a Venus-based attack with a power rating of 160 and a range of 3. It costs the user 22 PP.

In the story
At the top of Mars Lighthouse, the Wise One appears before the party. He says that he has no power to stop them from firing the beacon, prompting him to ask what would happen if a miracle were to occur. He summons the Doom Dragon to face Felix and co. The party is determined to defeat it, and by the time Kraden connects the dots and discovers that the dragon actually is Isaac's father Kyle and Felix and Jenna's parents (much like Saturos and Menardi were the Fusion Dragon), it is too late.

After the the fight, Kyle and Jenna and Felix's parents are practically dead. When Mars lighthouse is lit, their parents are miraculously restored by the beacon's power. Afterwards, Kraden hypothesizes that the Wise One, who apparently knew that the parents would be revived by the beacon's light, forced Isaac and the others to fight and destroy their own parents to test whether or not the party would be able to use the power of Alchemy responsibly.