As the Successor is weak to Crush/Ice/Blood, the Wrathful Balmung (DLC1 weapon) makes exceptionally short work of this challenge. The hardest part is to dodge the fire laser at the beginning of the entrance. Whenever facing the Successor of the Ribcage, remember the weaknesses. Running Slash builds against her do about 10% less damage than Crush. Therefore, the pipe kill against her would do well! Also, running high dark damage for the roar gifts would also put her down quickly unless her shield is up.
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