Pure arcane weapons/build suggestions?

I made a switch to a full arcane build for the very first time and been running an occult great katana and while I really like it I’m wondering what else I can do that would be good. My stats are roughly 70 arc, 14 str, 18 dex and then my int and fth are whatever the starting samurai class is. Is it just slapping occult on any weapon and I’ll be good? What about somber weapons other than rivers of blood or elanoras pole blade? Just looking for some variety in the event I come across a boss that’s resistant to the great katana.

I just know very little when it comes to arcane and what weapons are best used with it.