Forum:Rusted Weapons. What to go with?

So I'm able to finally polish one of my 5 rusted stones. I can make Demonlock, the Rusted Gsword, Rusted Lance, Rusted SnS, or the Rusted Hammer (MHF2). What should I go with? I'm fairly decent with Gswords, and I'm looking for a weapon with Dragon element. I am planning on probably making the Rusted Greatsword, but I don't know how to get elder Dragon Bloods. I hear that I can get them from Kusha, but I'm only HR3, so I can't kill it online with my friends. So how would I go about solo'ing Kusha or any of the other Elder Dragons for their blood?