I was able to defeat this boss using the Bone Cutting Sawblade upgraded to +5 with the Acidic Crystal Spear Handle and technique crank attached. Pretty straightforward if you use the summon and Flamberg Legion arm to stagger him quickly. Focus directly on the eldest brother don’t worry much about the others as your summons distracts them quite well
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![](https://i.ytimg.com/vi/AJX45Eg5ZVk/maxresdefault.jpg)