I present you with Bestla Part two
I recommend gear that ignores or take down barriers.
Also always use the physical burst version first then attack with Magic attacks.
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https://www.youtube.com/watch?v=mky6D-VFxqg
A bit of a not good noise quality
Here I present some of the builds you can use against this boss at 6* as it was the highest difficulty available at the time.
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https://www.youtube.com/watch?v=wXKqCgusXzQ
Father Gascoigne, a frustrating sight to see.
Bloodborne™
https://store.playstation.com/#!/en-us/tid=CUSA00900_00
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https://www.youtube.com/watch?v=u5zlcOmzfss