Chaos ( The 4 Heroes of Light boss ) Chaos is the final boss in " " . Chaos is fought in three different forms inside the final floor of Star Chamber . Battles . Preparation . Before the battle , the party should be equipped with the Holy Shields , as Chaos uses powerful Light - elemental spells . The Ribbon is also a necessity , as are the legendary artifacts . If you have the Hermes Sandals , give them to the character equipped with Lux . It is also advisable to equip all characters , regardless of job , with a healing spell , as there will be times where everyone needs to concentrate on it . During the encounter the player should bring an Elementalist , a healer , and two damage dealers . A Black Mage is especially useful for the Magic Might and Desolator spells . The Bard ' s Ditty , Motet , and Aria abilities can also be very useful . Either a White Mage or a Salve - Maker with a good item stock can serve in the healer role . First Form . The first form of Chaos uses a variety of White and Black Magic against the party and acts twice per turn . During the entire battle Chaos will cast Darkra , Darkaga , Banishra , and Banishga on the party . Chaos constantly casts Protect , Shell , and Haste on himself . During the later stages of the battle , Chaos begins to cast Slow and Stop on the party . As usual , the player should immediately cast Lux and Mysterio , and after that concentrate on healing and dealing damage . The Black Mage ' s Mirror ability is also useful , particularly if the player is using a Salve - Maker ( their healing won ' t be accidentally reflected while Mirror is up ) . The first form of Chaos will fall to steady attacks . However , when the music changes to reflect Chaos ' critical health , it ' s advisable to switch to normal attacks to conserve AP for the second form , as there is no chance for restoration between them . It ' s especially important that the character with Lux finish the battle with enough AP to immediately cast it at the start of the next . Second Form . Like his first form , the second form of Chaos acts two times per turn . During the beginning of the battle Chaos uses only normal physical attacks and the Fly Swat ability , which hits the entire party . After his HP falls below seventy - five percent , Chaos begins to use Blaze , Earthquake , Tsunami , and Lightning . These abilities deal elemental damage and cause certain status ailments on the party . They can also cause Instant Death . Like the previous battle , the player should immediately cast Lux and have their Elementalist use Mysterio ; keeping Mysterio active is especially important here because Chaos uses all of the elements in his attacks . The healer should heal every turn ( the Miracle spell is particularly useful for full healing and removing status effects , but a Salve - Maker with a Remedy is also useful ) . Damage - dealers should use their most powerful abilities whenever they have the AP for it unless they need to switch to healing . When the second form of Chaos is defeated , the entire party is fully healed . Third Form . Chaos in his third form is joined by his two arms in battle . The third form of Chaos acts twice per turn , usually once for each arm . The Left and Right Arm can only be attacked in the beginning and Chaos cannot be attacked until his arms are defeated . Chaos usually opens the battle by using Black Hole , to teleport a party member from the battle for four turns . His Right Arm uses the physical attack Hurl , which throws one character into a second one to damage both , and his Left Arm has a variety of magic spells in its arsenal . After both arms are defeated , Chaos enters the battle and begins to use the attacks he used in his second form and Big Bang to attack the entire party . When battle starts , the player should use Lux and Mysterio on the party . The player should use techniques that can attack both arms at once , such as Bladeblitz or Magic Might . The player should repeat this strategy for a couple of more turns until both of his arms have been defeated and keep their support and healer characters healing , and keep Mysterio up . After entering the battle Chaos will start to cast Big Bang on the party , which can deal heavy damage . Concentrate on healing with Healthcare + X - Potion or Curaga . If the player ' s healer has been absorbed by Black Hole , the best way to recover from this attack is to use X - Potion s or cast Cura on other party members . After he uses Big Bang , the player should have their damage - dealers concentrate on their strongest techniques . During the final stages of the battle Chaos will start to use Big Bang twice in one turn , which can deal heavy damage on the party and can even kill the player ' s White Mage and Black Mage . If this happens the player should use a Phoenix Down or Raise to revive KO ' d allies . After the player is done fully healing the party , the player should have their Hero and Black Mage attack Chaos , White Mage healing the party , and having their Elementalist recasting Mysterio . Once he is defeated , Chaos will cast Bigger Bang and the battle will end .