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When to use Koubu (higher MDEF and mobility): AOE bomb, can achieve the best AOE attacks ( Can use 8% atk accessory)
When to use Top star (higher HP and DEF): When you have APEX boot /divine- and you want to use her as a semi-tank.
Weapon:
Koubu:
Kervinter/balanced blade> Dragon Slayer> other SSR weapon
Top Star:
Ragnarok≈ Throne Guardian>>> other SSR axes
Armor: Carbon fiber armor>>> other SSR armor
Headgear: Carbon fiber Helmet>>>Reaper Breath > other SSR headgear
Accessory:
Koubu:
Overlord Badge> Slayer Emblem >Judgement talisman
Top Star:
APEX boot >>> Divine Boot
CLOCK >>>>>> everything else
Phoenix Dance + Strike/Butterfly Dance (No Iris u bring strike, when you have Iris bring butterfly Dance), Adversity.
Sky archer (a most common choice for Top Star Sumire with mobility +1 boot). Phalanx, Guardian Cavalry, Heavensguard depends on what your enemy uses and depends on what troop you have already invested.