Thank you very much for answering and the warm welcome.
There is this quest that you could kill a Monoblos but it doesn't give you a MAJESTIC RED HORN.
It gives you a Blood Red horn? Something like that but definitely not the MRH that i'm looking for.
I've searched most of the sites there but are no answer to my question (sad). This item is driving me nuts. But I will try your advice and try breaking the horns I could do it easily if I could get them stuck somewhere the thing is they wouldn't get stuck with the walls available.
Anyways if you find more info about this elusive MRH please help me thanks again.