Horned Sculptures

Hi,
What is the best way to get these Horned Scupltures?
Especially since apparently it takes a lot to make the weapons, like Anguished Twin Blades of Flame++
Any boss weakness to exploit on the Eldritch Beast ?

Please help.

I didn't find the right solution from the Internet.

References:
onigiri.cyberstep.com/_/forum/viewtopic.php?f=10&t=13235
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Thanks