Another, less classy solution is to get the Large Ember from the Depths and grind the slime monsters there until you can upgrade your Zwei to +10.[/font][/size][/color]
Never thought of that Depth grind, take the shortcut from the back with the master key. May end up doing that, or using the resin. I think I still have em....I should, don't recall using em.
I don't know if I wanna stick with the Zweihander though, it's meh.
Any other good 2handers? I was thinking the Black Knight Halberd.
Edit - Just realized the BKH isn't guarenteed to drop after I killed it in Dark Root Basin.
Didn't get it.