DFFOO GL (A Song of Ice and Iron CHAOS Challenge Machina LD, Arciela, Leon
Ifrit summon
Note: Machina and Arciela are EX+3LB with their enhancement boards. Arciela has her bloom passive and sphere equipped. Machina has his LD, his bloom passive, and the following spheres - his own and Gabranth (RF). Leon is EX+0LB.
Wave 1: Target Sniper x2 (completed on turn 30)
Wave 2: Ice Gigas x2 (completed on turn 61)
Wave 3: Flawless (completed on turn 77, 87)
Leon can make the fight easier to handle even he is at EX+0LB. I have him used his Dark absorption gimmick to tank the damage from ice Gigas. However, you need to know when to attack and when to guard. Guard when the Ice Gigas is using its elemental attacks (Blizzard Fist, Boulder, or Icequake). Attack when it is about use its other moveset. Have Machina use his LD and spam his skills to finish the battle. Try to keep 1 LD use per wave. Have him go LD, S1, HP+, S2/EX. Refresh his Awakening or extend it with his AA.
Have Arciela use her HP Silence on the Flawless after it does it's for AOE BRV attack. Before you kill it, summon and kill it in the summon. It will use Curaga to restore its HP to full but you should bypass its aura and make it easier to handle without the BRV reduction aura for the kill.
Score: 905k
Target Sniper
They start the battle targeting themselves and use Charge on their subsequent. They can remove your non-framed buffs with Eraser Machine Gun. Keep them broken or you will get hit by their single HP attacks - Missile or Smoke Shot. They have a 2 phase mode - Enemy Search which is followed by Target Lock On. After their 50% HP threshold, when you see them target all it means Matra Magic. If it does Out of Control and followed by AOE targeting, watch out for that as it will use Uncontrollable Fire. (AOE BRV +HP)
Gigas
They become dangerous once they break a target. Upon breaking a character, their BRV hits will enhance and stronger. They have fast turn rates too. They can do AOE breaks with Wallop. If you are using Leon to cheese the fight watch out as some of their abilities are elemental - Boulder Crush (ST, earth), Blizzard Fist (ST, Ice), and Icequake (AOE, Ice). They are pretty tanky. Use skills that have a BRV refund are advisable for this wave. Keep Arciela's HP Silence debuff or Vaan's blind debuff (from S2) is ideal to make them miss their attacks. If you have Vaan's BURST, it is best to use it this wave since his BURST effect nullifies breaks (i.e. Party BRV won't go below 20%).
Flawless
The dragon from Golbez LC is the last boss standing in your way. Usually, after an AOE BRV attack, it will follow up with a Holy Sword Art HP attack. If you have Arciela, use her S2 to apply the HP Silence debuff on it. Once you killed it for the first time, it will heal itself back full HP with Curaga and follow up with Angelic Aureole (removes non-framed debuff) with a massive BRV gain. Fortunately, it will lower its turn rate which allows you to shave that BRV. Watch out for its Bright Ray (BRV Gain, AOE BRV+HP) which can kill off your party if you are not careful.
I usually use my summon before I killed it the first time, to prevent the aura buff gain (however, it doesn't seem it is applicable for this fight unlike the Golbez LC CHAOS fight)
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